To Clear all Text Box, Dropdown list and Make All Check Box true when button click.

All TextBox or DropDownList or Checkbox are all must be in any Container (Panel,etc..)

        private void button1_Click(object sender, EventArgs e)

        {

               foreach (Control ctrl in pnl.Controls

           {

                    if (ctrl.GetType() == typeof(CheckBox))

                        ((CheckBox)ctrl).Checked = true;

                    if (ctrl.GetType() == typeof(Text Box))

                        ((Text Box)ctrl).Text = string.Empty;

                         if (ctrl.GetType() == typeof(DropDownList))

                        ((DropDownList Box)ctrl).SelectedValue = “0”;

                 }

       }