Something simple, you want to use ADO.NET to bind data from SQL Server to a GridView, here is your code behind

[codesyntax lang=”csharp”]
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class Default2 : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    string conn = ConfigurationManager.ConnectionStrings["STRINGNAME"].ConnectionString;
    SqlConnection con = new SqlConnection(conn);

    using (con)
    {
      SqlCommand cmd = new SqlCommand("SELECT * FROM Table", con);
      con.Open();
      SqlDataReader rdr = cmd.ExecuteReader();
      gv.DataSource = rdr;
      gv.DataBind();
    }
  }
}
[/codesyntax]

Here is your control

[codesyntax lang=”csharp”]

<asp:GridView ID=”gv” runat=”server” />

[/codesyntax]