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return stored procedure output value in vb.net

Posted on 2009-05-06
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I have seen the examples on returning parameters in stored  procedures that use the OUTPUT value.  I am unclear on the syntax however for returning the actual varchar value that is returned by the stored procedure.  It seems the examples return a value of 0 or 1.  How can I call the stored procedure with it's three paramaters and return the varchar value that is returned when the stored procedure is ran into a variable?  I thought using the executescalar method would accomplish this but it does not seem to be working.  Does anyone have any sample code I can look at?  Please advise.
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Question by:v4seasons
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cauos earned 1000 total points
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this code snippet below show how to create a stored procedure and call it from asp.net page
Sql Stored Procedure
Create PROCEDURE [dbo].[RS_TestGetUserName] 
 
@UserID int,
@username nvarchar(50) output
AS
begin
select @username = user_username from users where userid=@Userid
end
-------------------
VB.net code calling the stored procedure 
Dim constr As String = ConfigurationManager.ConnectionStrings("ConnStr").ConnectionString
            Dim con As New SqlConnection(constr)
            Dim cmd As New SqlCommand("RS_TestGetUserName", con)
            cmd.CommandType = Data.CommandType.StoredProcedure
            cmd.Parameters.AddWithValue("@UserID", 38107)
            cmd.Parameters.Add("@username", Data.SqlDbType.NVarChar, 50)
            cmd.Parameters("@username").Direction = Data.ParameterDirection.Output
            con.Open()
 
            cmd.ExecuteNonQuery()
            Dim username As String = cmd.Parameters("@username").Value.ToString()
            con.Close()

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