Database Restore - Object Cannot Be Cast From DBNull To Other Types

Oct 20, 2015

I want restore database in my disk , but i cant . I've click and add from device. this is the screen. And when i click content , it show me this text : Object cannot be cast from DBNull to other types. (mscorlib) . 

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Unable To Cast Object Of Type 'System.DBNull' To Type 'System.Byte[]'.

Aug 13, 2007

Hi,
I have developed a custom server control for .NET Framework 2.0. The server control has a property named BinaryData of type byte[]. I marked this property to be data bindable. Now, I have varbinary(Max) type of field in my SQL Database and I have used SQLDataSource and bound this varbinary(Max) field with the property BinaryData (byte[]) of my control. It is working fine as long as the data value is not NULL. Now, In my control, I have handled the NULL value so that no Exception is thrown. Still, when I bind this property using the SQLDataSource, I get Error "Unable to cast object of type 'System.DBNull' to type 'System.Byte[]'." I am not sure if I can do anything to stop this erro within my control. If it is not possible from the control, then what is the workaround that I can do in my ASPX page in order to stop this error ?
Thanks a lot in advance.

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HELP!! - Cast From DBNull When There Is Data

Apr 24, 2006

Hi,
I have built a few pages and a stored procedure and a class on the back of a SQL2000 dbase. and I get the following error:
 
Cast from type 'DBNull' to type 'String' is not valid.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Cast from type 'DBNull' to type 'String' is not valid.Source Error:




Line 111: Dim myWorkJobs As WorkJobsDATA = New WorkJobsDATA
Line 112:
Line 113: myWorkJobs.CustomerID = CStr(parameterCustomerID.Value)
Line 114: myWorkJobs.WorkID = CStr(parameterWorkID.Value)
Line 115: myWorkJobs.DateOfQuote = CStr(parameterDateOfQuote.Value).Trim()
Source File: C:InetpubwwwrootCommerceComponentsWorkJobs.vb    Line: 113
 
My Database has 1 line of data (for testing) and all fields are populated. I am Querying a column called IndividualID which has a value of 3425243 at the moment. This is hardcoded in the aspx.vb at the moment.
ASPX VB:
Public Class WorkRequest    Inherits System.Web.UI.Page
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load        'Put user code to initialize the page here    End Sub
    Private Sub btnEnter_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEnter.Click
        'for now, send this value (stored in dbase under individualID) to the querystring
        Dim IndividualID As String = "3425243"
        Response.Redirect("WorkRequestMain.aspx?IndividualID=" & IndividualID)    End SubEnd Class
 
COMPONENTSWorkJobs.vb (This is the class file)
 
Imports SystemImports System.ConfigurationImports System.DataImports System.Data.SqlClient
Namespace ASPNET.StarterKit.Commerce
        Public Class WorkJobsDATA
        Public CustomerID As String        Public WorkID As String        Public DateOfQuote As String        Public QuoteAmount As String        Public Title As Decimal        Public FirstName As String        Public Surname As String        Public FirstLine As String        Public District As String        Public Town As String        Public Postcode As String        Public Telephone As String        Public Requirements As String        Public WorkRequired As String        Public EmailAddress As String
    End Class
    Public Class WorkJobs
        Public Function GetWorkDetails(ByVal IndividualID As String) As WorkJobsDATA
            Dim myConnection As SqlConnection = New SqlConnection(ConfigurationSettings.AppSettings("ConnectionString"))            Dim myCommand As SqlCommand = New SqlCommand("SP_PendingQuotes", myConnection)
            ' Mark the Command as a SPROC            myCommand.CommandType = CommandType.StoredProcedure
            ' Add Parameters to SPROC            Dim parameterIndividualID As SqlParameter = New SqlParameter("@IndividualID", SqlDbType.NVarChar, 50)            parameterIndividualID.Value = IndividualID            myCommand.Parameters.Add(parameterIndividualID)
            Dim parameterCustomerID As SqlParameter = New SqlParameter("@CustomerID", SqlDbType.BigInt, 8)            parameterCustomerID.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterCustomerID)
            Dim parameterWorkID As SqlParameter = New SqlParameter("@WorkID", SqlDbType.NVarChar, 50)            parameterWorkID.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterWorkID)
            Dim parameterDateOfQuote As SqlParameter = New SqlParameter("@DateOfQuote", SqlDbType.DateTime, 8)            parameterDateOfQuote.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterDateOfQuote)
            Dim parameterQuoteAmount As SqlParameter = New SqlParameter("@QuoteAmount", SqlDbType.Money, 8)            parameterQuoteAmount.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterQuoteAmount)
            Dim parameterTitle As SqlParameter = New SqlParameter("@Title", SqlDbType.NVarChar, 50)            parameterTitle.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterTitle)
            Dim parameterFirstName As SqlParameter = New SqlParameter("@FirstName", SqlDbType.NVarChar, 50)            parameterFirstName.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterFirstName)
            Dim parameterSurname As SqlParameter = New SqlParameter("@Surname", SqlDbType.NVarChar, 50)            parameterSurname.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterSurname)
            Dim parameterFirstLine As SqlParameter = New SqlParameter("@FirstLine ", SqlDbType.NVarChar, 50)            parameterFirstLine.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterFirstLine)
            Dim parameterDistrict As SqlParameter = New SqlParameter("@District", SqlDbType.NVarChar, 50)            parameterDistrict.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterDistrict)
            Dim parameterTown As SqlParameter = New SqlParameter("@Town", SqlDbType.NVarChar, 50)            parameterTown.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterTown)
            Dim parameterPostcode As SqlParameter = New SqlParameter("@Postcode", SqlDbType.NVarChar, 50)            parameterPostcode.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterPostcode)
            Dim parameterTelephone As SqlParameter = New SqlParameter("@Telephone", SqlDbType.NVarChar, 50)            parameterTelephone.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterTelephone)
            Dim parameterRequirements As SqlParameter = New SqlParameter("@Requirements", SqlDbType.NVarChar, 3500)            parameterRequirements.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterRequirements)
            Dim parameterWorkRequired As SqlParameter = New SqlParameter("@WorkRequired", SqlDbType.NVarChar, 3500)            parameterWorkRequired.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterWorkRequired)
            Dim parameterEmailAddress As SqlParameter = New SqlParameter("@EmailAddress", SqlDbType.NVarChar, 100)            parameterEmailAddress.Direction = ParameterDirection.Output            myCommand.Parameters.Add(parameterEmailAddress)
            myConnection.Open()            myCommand.ExecuteNonQuery()            myConnection.Close()
            parameterEmailAddress.Value.GetType()
            Dim myWorkJobs As WorkJobsDATA = New WorkJobsDATA
            myWorkJobs.CustomerID = CStr(parameterCustomerID.Value)            myWorkJobs.WorkID = CStr(parameterWorkID.Value)            myWorkJobs.DateOfQuote = CStr(parameterDateOfQuote.Value).Trim()            myWorkJobs.Title = CStr(parameterTitle.Value).Trim()            myWorkJobs.FirstName = CStr(parameterFirstName.Value).Trim()            myWorkJobs.Surname = CStr(parameterSurname.Value).Trim()            myWorkJobs.FirstLine = CStr(parameterFirstLine.Value).Trim()            myWorkJobs.District = CStr(parameterDistrict.Value).Trim()            myWorkJobs.Town = CStr(parameterTown.Value).Trim()            myWorkJobs.Postcode = CStr(parameterPostcode.Value).Trim()            myWorkJobs.Telephone = CStr(parameterTelephone.Value).Trim()            myWorkJobs.Requirements = CStr(parameterRequirements.Value).Trim()            myWorkJobs.WorkRequired = CStr(parameterWorkRequired.Value).Trim()            myWorkJobs.EmailAddress = CStr(parameterEmailAddress.Value).Trim()
            Return myWorkJobs
        End Function
    End ClassEnd Namespace
 
And finally my stored procedure:
CREATE Procedure SP_PendingQuotes(    @IndividualID    nvarchar,    @CustomerID bigint OUTPUT,    @WorkID    nvarchar(50) OUTPUT,    @DateOfQuote datetime OUTPUT,    @QuoteAmount money OUTPUT,    @Title     nvarchar(50) OUTPUT,    @FirstName  nvarchar(50) OUTPUT,    @Surname  nvarchar(50) OUTPUT,    @FirstLine  nvarchar(50) OUTPUT,    @District  nvarchar(50) OUTPUT,    @Town  nvarchar(50) OUTPUT,    @Postcode  nvarchar(50) OUTPUT,    @Telephone  nvarchar(50) OUTPUT,    @Requirements  nvarchar(3500) OUTPUT,    @WorkRequired  nvarchar(3500) OUTPUT,    @EmailAddress  nvarchar(100) OUTPUT)AS
SELECT     @IndividualID = IndividualID,    @CustomerID = CustomerID,    @WorkID = WorkID,    @DateOfQuote = DateOfQuote,    @QuoteAmount = QuoteAmount,    @Title = Title,    @FirstName = FirstName,    @Surname = Surname,    @FirstLine = FirstLine,    @District = District,    @Town = Town,    @Postcode = Postcode,    @Telephone = Telephone,    @Requirements = Requirements,    @WorkRequired = WorkRequired,    @EmailAddress = EmailAddress
FROM     PendingQuotes
WHERE     IndividualID = @IndividualIDGO
 
 
 
Any ideas anyone?
I appreciate this is a big amount of data, but if anyone wants to chat to me i'm available on MSN Messenger under wolvokid@msn.com
 
 
 

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like how do i specify a style for it.

please help..


James : (

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But the issue remains the same, I have to click ok on the popup msg for about 20-30 times to make it go away and the dtsx package in the solution work just fine after closing the pop up.

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Hi,

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Nov 27, 2007



hi i dont know how to do type casting.

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Name:Variable datatype int32 values 0

Name: NumberofRowsdatatype int32 values 10000

Name: ObjVariable datatype Object



My code





public override void CreateNewOutputRows()

{

/*

Add rows by calling the AddRow method on the member variable named "<Output Name>Buffer".

For example, call MyOutputBuffer.AddRow() if your output was named "MyOutput".

*/

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//System.Data.Odbc.OdbcDataAdapter oLead = new System.Data.Odbc.OdbcDataAdapter();

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ADODB.Record rs = new ADODB.Record();



oLead.Fill(ds, rs, "Variables");

foreach (DataRow row in dt.Rows)

{

{

Output0Buffer.AddRow();

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}

}


}

}

This is the error

Unable to cast object of type 'System.Object' to type 'System.Data.DataSet'.

at ScriptMain.CreateNewOutputRows()

at UserComponent.PrimeOutput(Int32 Outputs, Int32[] OutputIDs, PipelineBuffer[] Buffers)

at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.PrimeOutput(Int32 outputs, Int32[] outputIDs, PipelineBuffer[] buffers)



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kedaranth

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If Not IsPostBack Thenfp = CType(Context.Handler, Member)
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'this labelbox for Email address is under the Name'lblEmail.Text = fp.EmailAddress.ToString
 
 Dim conn As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("imacstestConnectionString").ConnectionString)
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'.ExecuteScalar()
 
conn.Close()
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TITLE: Microsoft SQL Server Management Studio
------------------------------
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------------------------------
BUTTONS:
OK
------------------------------

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TITLE: Microsoft Visual Studio
------------------------------

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
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using System.Web.Configuration;
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}
}
}
 
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error:



Line 32:
Line 33: string str2 = FileUpload.PostedFile.ContentType;
Line 34: string connectionString = WebConfigurationManager.ConnectionStrings["GSGA"].ConnectionString;
Line 35:
Line 36: //Initialize SQL Server Connection Source File: c:UsersManojDocumentsVisual Studio 2005WebSitesGSGABinaryfrmUpload.aspx.cs    Line: 34  
Stack Trace:




[NullReferenceException: Object reference not set to an instance of an object.]
Binary_frmUpload.btnUpload_Click(Object sender, EventArgs e) in c:UsersManojDocumentsVisual Studio 2005WebSitesGSGABinaryfrmUpload.aspx.cs:34
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

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Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


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Line 126:
Line 127: MyCommand.Connection.Open()
Line 128:
Line 129: Try


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Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
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Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click

If (Page.IsValid) Then

Dim DS As DataSet
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MyCommand = New SqlCommand(AddAccount, MyConnection)

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MyCommand.Connection.Open()

MyCommand.ExecuteNonQuery()

Response.Redirect("Customer_Details.aspx?SS='CustHeadGrid.Columns[0].Item.lblSS.Text)")

MyCommand.Connection.Close()
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Line 57:
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ASP.dir_list_sort_aspx.BindFileDataToGrid(String strSortField) in D:YorZapdir_list_sort.aspx:56
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System.Web.UI.Control.OnLoad(EventArgs e) +80
System.Web.UI.Control.LoadRecursive() +49
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3743
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May 17, 2006

Dear all,

I am stuck with a SSIS package and I can€™t work out. Let me know what steps are the correct in order to solve this.
At first I have just a Flat File Source and then Script Component, nothing else.

Error:





[Script Component [516]] Error: System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to class type 'System.Data.SqlClient.SqlConnection'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface. at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.HandleUserException(Exception e) at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.AcquireConnections(Object transaction) at Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostAcquireConnections(IDTSManagedComponentWrapper90 wrapper, Object transaction)



Script Code (from Script Component):



' Microsoft SQL Server Integration Services user script component
' This is your new script component in Microsoft Visual Basic .NET
' ScriptMain is the entrypoint class for script components

Imports System
Imports System.Data.SqlClient
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper


Public Class ScriptMain
Inherits UserComponent


Dim nDTS As IDTSConnectionManager90
Dim sqlConnecta As SqlConnection
Dim sqlComm As SqlCommand
Dim sqlParam As SqlParameter


Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)

Dim valorColumna As String
Dim valorColumna10 As Double


valorColumna = Row.Column9.Substring(1, 1)

If valorColumna = "N" Then
valorColumna10 = -1 * CDbl(Row.Column10 / 100)
Else
valorColumna10 = CDbl(Row.Column10 / 100)
End If

Me.Output0Buffer.PORCRETEN = CDbl(Row.Column11 / 100)
Me.Output0Buffer.IMPRETEN = CDbl(Row.Column12 / 100)
Me.Output0Buffer.EJERCICIO = CInt(Row.Column2)
Me.Output0Buffer.CODPROV = CInt(Row.Column7)
Me.Output0Buffer.MODALIDAD = CInt(Row.Column8)
Me.Output0Buffer.NIFPERC = CStr(Row.Column3)
Me.Output0Buffer.NIFREP = CStr(Row.Column4)
Me.Output0Buffer.NOMBRE = CStr(Row.Column6)
Me.Output0Buffer.EJERDEV = CDbl(Row.Column13)

With sqlComm
.Parameters("@Ejercicio").Value = CInt(Row.Column2)
.Parameters("@NIFPerc").Value = CStr(Row.Column3)
.Parameters("@NIFReP").Value = CStr(Row.Column4)
.Parameters("@Nombre").Value = CStr(Row.Column6)
.Parameters("@CodProv").Value = CInt(Row.Column7)
.Parameters("@Modalidad").Value = CInt(Row.Column8)
.Parameters("@ImpBase").Value = valorColumna10
.Parameters("@PorcReten").Value = CDbl(Row.Column11 / 100)
.Parameters("@ImpReten").Value = CDbl(Row.Column12 / 100)
.Parameters("@EjerDev").Value = CDbl(Row.Column13)

.ExecuteNonQuery()
End With


End Sub
Public Overrides Sub AcquireConnections(ByVal Transaction As Object)

Dim nDTS As IDTSConnectionManager90 = Me.Connections.TablaMODELO80
sqlConnecta = CType(nDTS.AcquireConnection(Nothing), SqlConnection)

End Sub
Public Overrides Sub PreExecute()

sqlComm = New SqlCommand("INSERT INTO hac_modelo180(Ejercicio,NIFPerc,NIFReP,Nombre,CodProv,Modalidad,ImpBase,PorcReten,ImpReten,EjerDev) " & _
"VALUES(@Ejercicio,@NIFPerc,@NIFReP,@Nombre,@CodProv,@Modalidad,@ImpBase,@PorcReten,@ImpReten,@EjerDev)", sqlConnecta)
sqlParam = New SqlParameter("@Ejercicio", Data.SqlDbType.SmallInt)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@NIFPerc", Data.SqlDbType.Char)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@NIFReP", Data.SqlDbType.Char)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@Nombre", Data.SqlDbType.VarChar)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@CodProv", Data.SqlDbType.TinyInt)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@Modalidad", Data.SqlDbType.SmallInt)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@ImpBase", Data.SqlDbType.Decimal)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@PorcReten", Data.SqlDbType.Decimal)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@ImpReten", Data.SqlDbType.Decimal)
sqlComm.parameters.add(sqlParam)
sqlParam = New SqlParameter("@EjerDev", Data.SqlDbType.Decimal)
sqlComm.Parameters.Add(sqlParam)

End Sub


Public Sub New()

End Sub
Public Overrides Sub ReleaseConnections()
nDts.ReleaseConnection(sqlConnecta)
End Sub

Protected Overrides Sub Finalize()
MyBase.Finalize()
End Sub
End Class







Thanks a lot for your help


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***********************************
SQL Execution Error.

Executed SQL statement: SELECT Schoolindex, Variant, VVSchool, [index], indincl, VVRuimtes, School FROM School WHERE (Schoolindex = @PARAM1)



Error Source: SQL Server Compact Edition ADO.NET Data Provider


Error Message: @PARAM1 : Unable to cast object of type 'System.Data.SqlTypes.SqlInt32 to type System.IConvertable'.
****************************************

The same querypreview works fine without the parameter:



SELECT Schoolindex, Variant, VVSchool, [index], indincl, VVRuimtes, School FROM School WHERE (Schoolindex = 186)



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Unable to cast object of type 'System.String' to type 'System.Web.UI.WebControls.Parameter'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Unable to cast object of type 'System.String' to type 'System.Web.UI.WebControls.Parameter'.Source Error:




Line 14: If li.Selected Then
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Line 17:
Line 18:
Source File: C:InetpubwwwrootIntranetExternalAppsNewEmploymentClientNewClient.aspx.vb    Line: 16
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Just in case you think it could be an obvious registry problem: when I started getting the current error I thought that maybe the registry needed updating and I merged the following lines into onto the target machine (from my dev machine):

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOTInterface{B08400BD-F9D1-4D02-B856-71D5DBA123E9}]
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[HKEY_CLASSES_ROOTInterface{B08400BD-F9D1-4D02-B856-71D5DBA123E9}ProxyStubClsid]
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[HKEY_CLASSES_ROOTInterface{B08400BD-F9D1-4D02-B856-71D5DBA123E9}ProxyStubClsid32]
@="{00020424-0000-0000-C000-000000000046}"

[HKEY_CLASSES_ROOTInterface{B08400BD-F9D1-4D02-B856-71D5DBA123E9}TypeLib]
@="{EF53050B-882E-4776-B643-EDA472E8E3F2}"
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[HKEY_LOCAL_MACHINESOFTWAREClassesInterface{B08400BD-F9D1-4D02-B856-71D5DBA123E9}]
@="_Command"

[HKEY_LOCAL_MACHINESOFTWAREClassesInterface{B08400BD-F9D1-4D02-B856-71D5DBA123E9}ProxyStubClsid]
@="{00020424-0000-0000-C000-000000000046}"

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@="{00020424-0000-0000-C000-000000000046}"

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@="{EF53050B-882E-4776-B643-EDA472E8E3F2}"
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but, no change alas.

All three machines are running Windows 2000.

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