Question

I am returning 0 and 1 from a stored procedure like following. How can I fetch it in c# asp.net file?

ALTER procedure [dbo].[crudprocedure] 

    @getusername        varchar(20),
    @getfirstname       varchar(20),
    @getlastname        varchar(20),
    @getaddress         varchar(20)
 as 
 begin
IF not exists (select username from crudtable where username=@getusername)
begin 
insert into crudtable(username,firstname,lastname,address) 
values (@getusername,@getfirstname,@getlastname,@getaddress)
return 0
end
else
return 1
end

Answer 1

If you’re using SQL Server – then try this code here:

using (SqlConnection conn = new SqlConnection("...put your connection string here..."))
using (SqlCommand cmd = new SqlCommand("dbo.crudprocedure", conn))
{
   cmd.CommandType = CommandType.StoredProcedure;

   cmd.Parameters.Add("@getusername", SqlDbType.VarChar, 20).Value = "test";
   cmd.Parameters.Add("@getfirstname", SqlDbType.VarChar, 20).Value = "test";
   cmd.Parameters.Add("@getlastname", SqlDbType.VarChar, 20).Value = "test";
   cmd.Parameters.Add("@getaddress", SqlDbType.VarChar, 20).Value = "test";

   // define additional paramter of Direction = ReturnValue
   cmd.Parameters.Add("RETURN_VALUE", SqlDbType.Int).Direction = ParameterDirection.ReturnValue;

   // open connection, execute stored proc, close connection
   conn.Open();
   cmd.ExecuteNonQuery();
   conn.Close();

   // fetch the value of the "ReturnValue" parameter
   int returnValueInt = Convert.ToInt32(cmd.Parameters["RETURN_VALUE"].Value);
}

Basically, since you’re sending back that value using RETURN 1 from the stored procedure, you need to add an additional parameter to your SqlCommand object that has a .Direction of ParameterDirection.ReturnValue.

That parameter will be set to the value that you send back from the stored procedure using RETURN ....