System.InvalidOperationException: ExecuteReader: Connection Property Has Not Been Initialized.

Hi,

I have written a CLR Function in C#. The function works as expected except that I am trying to read data some data during the function call and get the following error:


Msg 6522, Level 16, State 1, Line 1

A .NET Framework error occurred during execution of user-defined routine or aggregate "fn_SLARemaining":

System.InvalidOperationException: ExecuteReader: Connection property has not been initialized.

System.InvalidOperationException:

at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)

at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)

at System.Data.SqlClient.SqlCommand.ExecuteReader()

at SLARemaining.SupportTimes.addSupportHours()

at SLARemaining.CalculateTimeRemaining.GetTimeRemaining(String openDate, Decimal SLADuration)

at UserDefinedFunctions.fn_SLARemaining(SqlDateTime DateFrom, SqlDateTime DateTo, SqlInt32 PriorityTime, SqlDecimal AdjustmentTime, SqlDecimal Status)

.


The main code for the function is this:


using System;

using System.Data;

using System.Data.SqlTypes;

using System.Data.SqlClient;

using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions

{

[Microsoft.SqlServer.Server.SqlFunction(DataAccess = DataAccessKind.Read)]

public static SqlString fn_SLARemaining(SqlDateTime @DateFrom, SqlDateTime @DateTo, SqlInt32 @PriorityTime, SqlDecimal @AdjustmentTime, SqlDecimal @Status)

{

SLARemaining.CalculateTimeRemaining remaining;

remaining = new SLARemaining.CalculateTimeRemaining();

int duration = Convert.ToInt32(PriorityTime.ToString());

if (!DateFrom.IsNull)

{

string date = DateFrom.Value.ToShortDateString() + " " + DateFrom.Value.ToShortTimeString();

SqlString result = remaining.GetTimeRemaining(date, duration);

return result;

}

else

{

return null;

}

}

};


The function calls the following method from another class:


public string[] addSupportHours()

{

string[] supportedHours = new string[28];

SqlDataReader dr;



SqlCommand cmd = new SqlCommand();

cmd.CommandText = "xxxxxxx"; //<-- commented out for this post

using (SqlConnection cn = new SqlConnection("context connection=true;"))

{

cn.Open();


dr = cmd.ExecuteReader();



while (dr.Read())

{
//do some stuff
}

cn.Close();

cn.Dispose();
}

The error message claims that the connection has not been initialized - can't work out why? Any help will be appreciated!