docs-desktop/dotnet-desktop-guide/framework/winforms/controls/how-to-set-options-with-windows-forms-checkbox-controls.md

title, ms.date, dev_langs, f1_keywords, helpviewer_keywords, ms.assetid

title	ms.date	dev_langs	f1_keywords	helpviewer_keywords	ms.assetid
Set Options with CheckBox Controls	03/30/2017	csharp vb cpp	checked	CheckBox control [Windows Forms], checked state check boxes [Windows Forms], using to set options CheckBox control [Windows Forms], using to set options	2ac70498-7e3e-4e07-8901-ccabaeb5fd3e

How to: Set Options with Windows Forms CheckBox Controls

A Windows Forms xref:System.Windows.Forms.CheckBox control is used to give users True/False or Yes/No options. The control displays a check mark when it is selected.

To set options with CheckBox controls

1. Examine the value of the xref:System.Windows.Forms.CheckBox.Checked%2A property to determine its state, and use that value to set an option.

   In the code sample below, when the xref:System.Windows.Forms.CheckBox control's xref:System.Windows.Forms.CheckBox.CheckedChanged event is raised, the form's xref:System.Windows.Forms.Control.AllowDrop%2A property is set to false if the check box is checked. This is useful for situations where you want to restrict user interaction.

   Private Sub CheckBox1_CheckedChanged(ByVal sender As System.Object, _  
      ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged  
      ' Determine the CheckState of the check box.  
      If CheckBox1.CheckState = CheckState.Checked Then  
         ' If checked, do not allow items to be dragged onto the form.  
         Me.AllowDrop = False  
      End If  
   End Sub  
   

   private void checkBox1_CheckedChanged(object sender, System.EventArgs e)  
   {  
      // Determine the CheckState of the check box.  
      if (checkBox1.CheckState == CheckState.Checked)
      {  
         // If checked, do not allow items to be dragged onto the form.  
         this.AllowDrop = false;  
      }  
   }  
   

   private:  
      void checkBox1_CheckedChanged(System::Object ^ sender,  
         System::EventArgs ^ e)  
      {  
         // Determine the CheckState of the check box.  
         if (checkBox1->CheckState == CheckState::Checked)
         {  
            // If checked, do not allow items to be dragged onto the form.  
            this->AllowDrop = false;  
         }  
      }  
   

See also

• xref:System.Windows.Forms.CheckBox
• CheckBox Control Overview
• How to: Respond to Windows Forms CheckBox Clicks
• CheckBox Control