GridView1_SelectedIndexChanged_1

SelectedIndexChanged
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protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = GridView1.SelectedRow.Cells[0].Text;
TextBox2.Text = GridView1.SelectedRow.Cells[1].Text;
TextBox3.Text = GridView1.SelectedRow.Cells[2].Text;
TextBox4.Text = GridView1.SelectedRow.Cells[3].Text;
}