System.Object.GetType C# (CSharp) Method

    public extern Type GetType();

 private void field_DataBinding(Object sender, EventArgs e)
 {
     Control c = (Control)sender;
     GridViewRow row = (GridViewRow)c.NamingContainer;
     if (sender.GetType() == typeof(Label))
     {
         (c as Label).Text = DataBinder.Eval(row.DataItem, columnNameData).ToString();
         (c as Label).Font.Size = 7;
         (c as Label).Font.Name = "Arial";
     }
     else if (sender.GetType() == typeof(TextBox))
     {
         (c as TextBox).Text = DataBinder.Eval(row.DataItem, columnNameData).ToString();
         (c as TextBox).Font.Size = 7;
         (c as TextBox).Font.Name = "Arial";
     }
     else if (sender.GetType() == typeof(DropDownList))
     {
         (c as DropDownList).SelectedValue = DataBinder.Eval(row.DataItem, columnNameData).ToString();
         (c as DropDownList).Font.Size = 7;
         (c as DropDownList).Font.Name = "Arial";
     }
     else if (sender.GetType() == typeof(CheckBox))
     {
         (c as CheckBox).Checked = (bool)DataBinder.Eval(row.DataItem, columnNameData);
     }
 }