Search Record Display in DetailsView1

Question

 

SqlDataAdapter sda = new SqlDataAdapter("select * from student_login", con);

DataTable dt = new DataTable();
sda.Fill(dt);
int c = dt.Rows.Count;


if (dt.Rows[0][4].ToString() == TextBox1.Text)
{
DataTable dt = new DataTable();
sda.Fill(dt);
DetailsView1.DataSource = dt;
DetailsView1.DataBind();

}

 

when recrod found its show

only 1St record show of the Table.

please help to show column 2 and 3 4 .....ext...

and how to use ISPOSTBACK option.... of this page...