Error When Running A Stored Procedure From My Code

 Hi all,
      I wonder if you can help me with this. Basically, Visual Web Developer doesn't like this part of my code despite the fact that the stored procedure has been created in MS SQL. It just won't accept that bold line in the code below and even when I comment it just to cheat, it still gives me an error about the Stored Procedure. Here's the line of code:
          // Define data objects
        SqlConnection conn;
        SqlCommand comm;
        // Initialize connection
        string connectionString =
            ConfigurationManager.ConnectionStrings[
            "pay"].ConnectionString;
        // Initialize connection
        conn = new SqlConnection(connectionString);
        // Create command
        comm = new SqlCommand("UpdatePaymentDetails", conn);
        //comm.CommandType = CommandType.StoredProcedure;
        // Add command parameters
        comm.Parameters.Add("PaymentID", System.Data.SqlDbType.Int);
        comm.Parameters["PaymentID"].Value = paymentID;
        comm.Parameters.Add("NewPayment", System.Data.SqlDbType.VarChar, 50);
        comm.Parameters["NewPayment"].Value = newPayment;
        comm.Parameters.Add("NewInvoice", System.Data.SqlDbType.VarChar, 50);
        comm.Parameters["NewInvoice"].Value = newInvoice;
        comm.Parameters.Add("NewAmount", System.Data.SqlDbType.Money);
        comm.Parameters["NewAmount"].Value = newAmount;
        comm.Parameters.Add("NewMargin", System.Data.SqlDbType.VarChar, 50);
        comm.Parameters["NewMargin"].Value = newMargin;
        comm.Parameters.Add("NewProfit", System.Data.SqlDbType.Money);
        comm.Parameters["NewProfit"].Value = newProfit;
        comm.Parameters.Add("NewEditDate", System.Data.SqlDbType.DateTime);
        comm.Parameters["NewEditDate"].Value = newEditDate;
        comm.Parameters.Add("NewQStatus", System.Data.SqlDbType.VarChar, 50);
        comm.Parameters["NewQStatus"].Value = newQStatus;
        comm.Parameters.Add("NewStatus", System.Data.SqlDbType.VarChar, 50);
        comm.Parameters["NewStatus"].Value = newStatus;
        // Enclose database code in Try-Catch-Finally
        try
        {
            conn.Open();
            comm.ExecuteNonQuery();
        }