****Вторые значения текстовых полей, добавляющих и удаляющих первые значения в gridview...****
Код
protected void Button1_Click(object sender, EventArgs e)
{
DataTable dt1 = new DataTable();
dt1.Columns.Add(new DataColumn("Name", typeof(System.String)));
dt1.Columns.Add(new DataColumn("Age", typeof(System.String)));
dt1.Columns.Add(new DataColumn("Gender", typeof(System.String)));
dt1.Columns.Add(new DataColumn("Qualification", typeof(System.String)));
DataRow dr = dt1.NewRow();
dr["Name"] = TextBox1.Text;
dr["Age"] = TextBox2.Text;
dr["Gender"] = TextBox3.Text;
dr["Qualification"] = TextBox4.Text;
dt1.Rows.Add(dr);
DataSet ds = new DataSet();
ds.Tables.Add(dt1);
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Name", typeof(System.String)));
dt.Columns.Add(new DataColumn("Age", typeof(System.String)));
dt.Columns.Add(new DataColumn("Gender", typeof(System.String)));
dt.Columns.Add(new DataColumn("Qualification", typeof(System.String)));
DataRow dr1 = dt1.NewRow();
dr1["Name"] = TextBox1.Text;
dr1["Age"] = TextBox2.Text;
dr1["Gender"] = TextBox3.Text;
dr1["Qualification"] = TextBox4.Text;
dt.Rows.Add(dr1);
DataSet ds1 = new DataSet();
ds1.Tables.Add(dt);
GridView1.DataSource = ds1.Tables[0];
GridView1.DataBind();
}