First of all,
Set Auto Postback property true for both Radio Button. and set Visible property False to both panel. also give Groupname Same to Both Radio Button.
then Double Click on First Radio Button.... So ,you get Method of Radio Button.
Inside it....
If(RadioButton1.Checked)
{
Panel.visible=true;
}
else
{
Panel2.visible=false;
}
then Double Click on Second Radio Button.... So ,you get Method of Radio Button.
Inside it...
If(RadioButton2.Checked)
{
Panel1.visible=false;
}
else
{
Panel2.visible=true;
}