ASP.NET will gives you adaptability by they way you connect with databases. It would be ideal if you include the following code in your aspx page and check how to get connection on .aspx page. And here is the code that I used:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="onpageconnection.aspx.cs" Inherits="onpageconnection" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Import Namespace="System.Data.OleDb" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ import Namespace="System.Data" %>
<script  runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            System.Data.SqlClient.SqlConnection con;
            sqlconn objconn = new sqlconn();
            con = objconn.getcon();
            con.Open();
            String str = "select * from EmpDemo";
            //SqlCommand cmd = new SqlCommand(str,con);
            //SqlDataReader adp;
            SqlDataAdapter adp = new SqlDataAdapter(str,con);
                        DataSet ds = new DataSet();
            adp.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();
            //Response.Write("connection open");       
}
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
    }
</script>
<html>
<head>
<title></title>
</head>
<body>
<form id="Form1" runat="server">
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
</form>
</body>
</html>

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