Accessing A Stored Procedure From ADO.NET 2.0-VB 2005 Express:How To Define/add 1 Output && 2 Input Parameters In Param. Coll.?

Hi all,

In a Database "AP" of my SQL Server Management Studio Express (SSMSE), I have a stored procedure "spInvTotal3":

CREATE PROC [dbo].[spInvTotal3]

@InvTotal money OUTPUT,

@DateVar smalldatetime = NULL,

@VendorVar varchar(40) = '%'



This stored procedure "spInvTotal3" worked nicely and I got the Results: My Invoice Total = $2,211.01 in
my SSMSE by using either of 2 sets of the following EXEC code:
(1)
USE AP
GO
--Code that passes the parameters by position
DECLARE @MyInvTotal money
EXEC spInvTotal3 @MyInvTotal OUTPUT, '2006-06-01', 'P%'
PRINT 'My Invoice Total = $' + CONVERT(varchar,@MyInvTotal,1)
GO
(2)
USE AP
GO
DECLARE @InvTotal as money
EXEC spInvTotal3
@InvTotal = @InvTotal OUTPUT,
@DateVar = '2006-06-01',
@VendorVar = '%'
SELECT @InvTotal
GO
////////////////////////////////////////////////////////////////////////////////////////////
Now, I want to print out the result of @InvTotal OUTPUT in the Windows Application of my ADO.NET 2.0-VB 2005 Express programming. I have created a project "spInvTotal.vb" in my VB 2005 Express with the following code:


Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.SqlTypes

Public Class Form1

Public Sub printMyInvTotal()

Dim connectionString As String = "Data Source=.SQLEXPRESS; Initial Catalog=AP; Integrated Security=SSPI;"

Dim conn As SqlConnection = New SqlConnection(connectionString)

Try

conn.Open()

Dim cmd As New SqlCommand

cmd.Connection = conn

cmd.CommandType = CommandType.StoredProcedure

cmd.CommandText = "[dbo].[spInvTotal3]"

Dim param As New SqlParameter("@InvTotal", SqlDbType.Money)

param.Direction = ParameterDirection.Output

cmd.Parameters.Add(param)

cmd.ExecuteNonQuery()

'Print out the InvTotal in TextBox1

TextBox1.Text = param.Value

Catch ex As Exception

MessageBox.Show(ex.Message)

Throw

Finally

conn.Close()

End Try

End Sub

End Class
/////////////////////////////////////////////////////////////////////
I executed the above code and I got no errors, no warnings and no output in the TextBox1 for the result of "InvTotal"!!??
I have 4 questions to ask for solving the problems in this project:
#1 Question: I do not know how to do the "DataBinding" for "Name" in the "Text.Box1".
How can I do it?
#2 Question: Did I set the CommandType property of the command object to
CommandType.StoredProcedure correctly?
#3 Question: How can I define the 1 output parameter (@InvTotal) and
2 input parameters (@DateVar and @VendorVar), add them to
the Parameters Collection of the command object, and set their values
before I execute the command?
#4 Question: If I miss anything in print out the result for this project, what do I miss?

Please help and advise.

Thanks in advance,
Scott Chang