从ASP.NET WinForm向存储过程传递参数

Question

I'm having trouble with passing parameter to stored procedure. No error thrown but desired output cannot be acquired. .cs is:

private void btnSubmit_Click(object sender, EventArgs e)
{
    try
    {
        if (cbRegions.SelectedIndex > 0)
        {
            con = new SqlConnection(connectionString);
            cmd = new SqlCommand("dbo.SectionIncharge", con);
            cmd.Parameters.Add("@RegionName", SqlDbType.VarChar, 50).Value = cbRegions.SelectedItem.ToString();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Connection = con;
            con.Open();
            DataTable table = new DataTable();
            table.Load(cmd.ExecuteReader());
            dgvResults.DataSource = table;
            con.Close();
        }
    }
    catch
    {

    }
}

.sql is:

ALTER PROCEDURE [dbo].[SectionIncharge] @RegionName varchar(50)  --name
AS
select UserName
from SystemUser 
where Description LIKE 'RD OFFICE ' + @RegionName  AND
Enable = 'Y'
GO

I've double checked stored procedure working fine in SQL Server Management Studio but when I'm trying to call it from WinForm, no output. Can someone please help. Thanks

Answer 1

Method ExecuteNonQuery (as it can be guessed from the name) just executes query and doesn't receives any output from server.

So of you need to get results you're selecting - you have to use ExecuteReader method and process result it returns (see example at the bottom of MSDN page I've linked).

Alternatively, if you're using datatables as source for your grid - you can use SqlDataAdapter class and it's Fill method to fill such a datatable.