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Clear a form

This is a snippet I use to clear a form. Right now it clears: TextBox, RichTextBox, ComboBox, CheckBox and RadioButton. More can be added if needed

Submitted By: PsychoCoder

Actions:

Rating:

Views: 18,158

Language: C#

Last Modified: September 7, 2007

Instructions: Call the method like so: ClearForm(this);

Snippet

public static void ClearForm(System.Windows.Forms.Control parent)
{
foreach (System.Windows.Forms.Control ctrControl in parent.Controls)
{
//Loop through all controls
if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.TextBox)))
{
//Check to see if it's a textbox
((System.Windows.Forms.TextBox)ctrControl).Text = string.Empty;
//If it is then set the text to String.Empty (empty textbox)
}
else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.RichTextBox)))
{
//If its a RichTextBox clear the text
((System.Windows.Forms.RichTextBox)ctrControl).Text = string.Empty;
}
else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.ComboBox)))
{
//Next check if it's a dropdown list
((System.Windows.Forms.ComboBox)ctrControl).SelectedIndex = -1;
//If it is then set its SelectedIndex to 0
}
else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.CheckBox)))
{
//Next uncheck all checkboxes
((System.Windows.Forms.CheckBox)ctrControl).Checked = false;
}
else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.RadioButton)))
{
//Unselect all RadioButtons
((System.Windows.Forms.RadioButton)ctrControl).Checked = false;
}
if (ctrControl.Controls.Count > 0)
{
//Call itself to get all other controls in other containers
ClearForm(ctrControl);
}
}
}
//Example call
ClearForm(this);

Copy & Paste

public static void ClearForm(System.Windows.Forms.Control parent)
{
    foreach (System.Windows.Forms.Control ctrControl in parent.Controls)
    {
         //Loop through all controls 
         if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.TextBox)))
         {
              //Check to see if it's a textbox 
              ((System.Windows.Forms.TextBox)ctrControl).Text = string.Empty;
                    //If it is then set the text to String.Empty (empty textbox) 
          }
          else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.RichTextBox)))
          {
               //If its a RichTextBox clear the text
               ((System.Windows.Forms.RichTextBox)ctrControl).Text = string.Empty;
          }
          else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.ComboBox)))
          {
               //Next check if it's a dropdown list 
               ((System.Windows.Forms.ComboBox)ctrControl).SelectedIndex = -1;
                    //If it is then set its SelectedIndex to 0 
          }
          else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.CheckBox)))
          {
               //Next uncheck all checkboxes
               ((System.Windows.Forms.CheckBox)ctrControl).Checked = false;
          }
          else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.RadioButton)))
          {
               //Unselect all RadioButtons
               ((System.Windows.Forms.RadioButton)ctrControl).Checked = false;
          }
          if (ctrControl.Controls.Count > 0)
          {
              //Call itself to get all other controls in other containers 
              ClearForm(ctrControl);
          }
     }
}

//Example call
ClearForm(this);

Comments
kamlakar 2008-04-14 05:02:26

marinaccio 2008-04-30 07:42:56
That's pretty clever!
wartech 2008-08-26 23:07:53
nice!
clarence_cool03 2009-05-13 22:48:33
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Rathika 2009-08-11 02:46:07
Hi How to Clear a Web Page Control values
wjstarck 2010-01-20 14:13:17
Nice snippet....saved my lots of hair pulling. Thanks!
wjstarck 2010-01-20 20:02:46
Arrgh...unfortunately it doesn't work if the controls are contained in a group box. Any suggestions? Thx
wjstarck 2010-01-20 21:01:25
Gaah..nvm. I was trying inside of a mousedown event instead of a listbox_SelectedIndexChanged. Works like a charm now. Thanks a million...