Question

From within a C# WinForms app I must execute a parameterized Stored Procedure on a MS SQL Express Server. The Database Connection works, the Procedure works either, but I get an Error Message:

42000: Missing Parameter ‘@KundenEmail’

although I’m sure I added the parameter correctly. Maybe some of you could have a look – I don’t know what to search for any more…

OdbcConnection ODBCConnection = new OdbcConnection();

try
{
    ODBCConnection.ConnectionString = ODBCConnectionString;
    ODBCConnection.Open();
}
catch (Exception DatabaseConnectionEx)
{
    if (ODBCConnection != null)
        ODBCConnection.Dispose();

    // Error Message

    return null;
}

OdbcParameter ODBCParameter = new OdbcParameter("@KundenEmail", OdbcType.NChar, 50);
ODBCParameter.Value = KundenEmail;

OdbcCommand ODBCCommand = new OdbcCommand("getDetailsFromEmail", ODBCConnection);
ODBCCommand.CommandType = CommandType.StoredProcedure;
ODBCCommand.Parameters.Add(ODBCParameter);

DataTable DataTable = new DataTable();

OdbcDataAdapter ODBCDatadapter = new OdbcDataAdapter(ODBCCommand);
ODBCDatadapter.Fill(DataTable);
ODBCDatadapter.Dispose();

ODBCConnection.Close();
ODBCConnection.Dispose();

This is the error message I get:

ERROR [4200][Microsoft][ODBC SQL Server]The Procedure or method
‘getDetailsFromEmail’ expects the ‘@KundenEmail’-parameter, which
was not supplied.

Ah, I missed the connection string

private static String ODBCConnectionString = "Driver={SQL Server};Server=TESTSRV\\SQLEXPRESS;Database=TestDatabase;";

Any ideas? Thanks in advance.

Answer 1

Well – I now managed to solve the problem on my own, with some help from the MSDN-documentation.

The correct statement to execute a stored procedure via ODBC is as follows:

OdbcCommand ODBCCommand = new OdbcCommand("{call getDetailsFromEmail (?)}", ODBCConnection);
ODBCCommand.CommandType = CommandType.StoredProcedure;
ODBCCommand.Parameters.AddWithValue("@KundenEmail", KundenEmail);

Nevertheless – thanks for your help Thorsten.