Calling stored procedure with return value

Question

I am trying to call a stored procedure from my C# windows application. The stored procedure is running on a local instance of SQL Server 2008. I am able to call the stored procedure but I am not able to retrieve the value back from the stored procedure. This stored procedure is supposed to return the next number in the sequence. I have done research online and all the sites I've seen have pointed to this solution working.

Stored procedure code:

ALTER procedure [dbo].[usp_GetNewSeqVal]       @SeqName nvarchar(255) as begin       declare @NewSeqVal int       set NOCOUNT ON       update AllSequences       set @NewSeqVal = CurrVal = CurrVal+Incr       where SeqName = @SeqName        if @@rowcount = 0 begin print 'Sequence does not exist'             return       end        return @NewSeqVal end 

Code calling the stored procedure:

SqlConnection conn = new SqlConnection(getConnectionString()); conn.Open();  SqlCommand cmd = new SqlCommand(parameterStatement.getQuery(), conn); cmd.CommandType = CommandType.StoredProcedure;  SqlParameter param = new SqlParameter();  param = cmd.Parameters.Add("@SeqName", SqlDbType.NVarChar); param.Direction = ParameterDirection.Input; param.Value = "SeqName";  SqlDataReader reader = cmd.ExecuteReader(); 

I have also tried using a DataSet to retrieve the return value with the same result. What am I missing to get the return value from my stored procedure? If more information is needed, please let me know.

Answer 1

You need to add return parameter to the command:

using (SqlConnection conn = new SqlConnection(getConnectionString())) using (SqlCommand cmd = conn.CreateCommand()) {     cmd.CommandText = parameterStatement.getQuery();     cmd.CommandType = CommandType.StoredProcedure;     cmd.Parameters.AddWithValue("SeqName", "SeqNameValue");      var returnParameter = cmd.Parameters.Add("@ReturnVal", SqlDbType.Int);     returnParameter.Direction = ParameterDirection.ReturnValue;      conn.Open();     cmd.ExecuteNonQuery();     var result = returnParameter.Value; }