gridview row is deleted but it show again when we delete the

if i delete the 1st row in a gridview then am going to delete the 2nd row. if i delete the 2nd row the first row again show.but i need to delete it without affect the database.

my code is

private void BindData()

{

string constr = ConfigurationManager.AppSettings["s"].ToString();

string query = "select Id, Name, Status FROM aten";

SqlDataAdapter da = new SqlDataAdapter(query, constr);

DataSet ds = new DataSet();

DataTable DataTable1 = new DataTable();

da.Fill(DataTable1);

GridView1.DataSource = DataTable1;

GridView1.DataBind();

ViewState["UsingSelectedRow"] = DataTable1;

ViewState["UsingRowDeleting"] = DataTable1;

ViewState["UsingLinkButtonOnClick"] = DataTable1;

}

protected void Delete(object sender, EventArgs e)

{

int index = Convert.ToInt32(((sender as LinkButton).NamingContainer as GridViewRow).RowIndex);

DataTable dt = (DataTable)ViewState["UsingLinkButtonOnClick"];

dt.Rows.RemoveAt(index);

this.GridView1.DataSource = dt;

this.GridView1.DataBind();

}