. aspx page
 
Code File:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class FormView : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
            BindFormView();
    }
    public void BindFormView()
    {
        SqlConnection con = new SqlConnection("trusted_connection=true;database=FormDB");
        SqlDataAdapter da = new SqlDataAdapter("select * from table1", con);
        DataSet ds = new DataSet();
        da.Fill(ds);
        DropDownList1.DataSource = ds;
        DropDownList1.DataTextField = "Name";
        DropDownList1.DataBind();

    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection("trusted_connection=true;database=FormDB");
        SqlCommand cmd = new SqlCommand("Select * from Table1 where Name=@Name", con);
        SqlParameter pa = new SqlParameter("@Name", DbType.String);
        pa.Value = DropDownList1.SelectedItem.Text;
        cmd.Parameters.Add(pa);
        SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = cmd;
        DataSet ds = new DataSet();
        da.Fill(ds);
        FormView1.DataSource = ds;
        FormView1.DataBind();
       

    }
}
Source page:
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
            onselectedindexchanged="DropDownList1_SelectedIndexChanged">
        </asp:DropDownList>
        <br />
        <br />
        <asp:FormView ID="FormView1" runat="server">
        <ItemTemplate >
        <%#Eval ("Name") %><br />
        <%#Eval ("Address") %><br />
        <%#Eval ("Cource") %><br />
        </ItemTemplate>
        </asp:FormView>