jquery - show textbox when checkbox checked

Question

I have this form

Answer 1

protected void EnableTextBox()
{
    int count = int.Parse(GridView1.Rows.Count.ToString());

    for (int i = 0; i < count; i++)
    {
        CheckBox cb = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("CheckBox1");
        CheckBox cb1 = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("CheckBox2");
        CheckBox cb2 = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("CheckBox3");
        TextBox tb = (TextBox)GridView1.Rows[i].Cells[4].FindControl("txtration");
        TextBox tb1 = (TextBox)GridView1.Rows[i].Cells[5].FindControl("txtjob");
        TextBox tb2 = (TextBox)GridView1.Rows[i].Cells[6].FindControl("txtaadhar");            

        if (cb.Checked == true)
        {
            tb.Visible = true;               
        }
        else
        {
            tb.Visible = false;    
        }

        if (cb1.Checked == true)
        {
            tb1.Visible = true;                
        }
        else
        {
            tb1.Visible = false;              
        }

        if (cb2.Checked == true)
        {
            tb2.Visible = true;               
        }
        else
        {
            tb2.Visible = false;
        }
    }
}

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    EnableTextBox();
}