Home / Community & Support / Developer Productivity Tools Forums / WinForms > Buttons, RadioButton, CheckBox, etc > multiple checkboxes allow one check at a time

• Scott

  Posted on Apr 27, 2011 (permalink)

  
private void rchk3Yes_Click(object sender, EventArgs e)

        {

            if (((Telerik.WinControls.UI.RadCheckBox)sender).Checked == true)

            {

                //already checked, it will uncheck

                rchk3Yes.Checked = false;

            }

            else

            {

                //checks itself and unchecks other checkboxes

                if (rchkUnknown.Checked == true)

                {

                    rchkUnknown.Checked = false;

                }

                if (rchk3No.Checked == true)

                {

                    rchk3No.Checked = false;

                }

            }

        }

  
  Hi I am trying to make 3 checkboxes that only allow one or none to be checked, if one is checked the others are unchecked. Here is the code I have but it doesnt work right.
   

  Reply

• Emanuel Varga MVP

  Posted on Apr 29, 2011 (permalink)

  Hello Scott,
  
  Please take a look at the following example:
  
  

  using System.Windows.Forms;

  using Telerik.WinControls.UI;

   

  public partial class Form1 : Form

  {

      private FlowLayoutPanel flowPanel;

      private bool localChange;

   

      public Form1()

      {

          InitializeComponent();

          flowPanel = new FlowLayoutPanel();

          flowPanel.Dock = DockStyle.Fill;

          this.Controls.Add(flowPanel);

   

          for (int i = 0; i < 10; i++)

          {

              var checkBox = new RadCheckBox();

              checkBox.ToggleStateChanged += new StateChangedEventHandler(radCheckBox_ToggleStateChanged);

              checkBox.Text = "CheckBox" + i;

              flowPanel.Controls.Add(checkBox);

          }

      }

   

      void radCheckBox_ToggleStateChanged(object sender, StateChangedEventArgs args)

      {

          if (localChange)

          {

              return;

          }

   

          ToggleState(sender as RadCheckBox);

      }

   

      private void ToggleState(RadCheckBox radCheckBox)

      {

          localChange = true;

   

          foreach (var control in flowPanel.Controls)

          {

              var checkBox = control as RadCheckBox;

              if (checkBox != null && checkBox != radCheckBox && checkBox.ToggleState != Telerik.WinControls.Enumerations.ToggleState.Off)

              {

                  checkBox.ToggleState = Telerik.WinControls.Enumerations.ToggleState.Off;

              }

          }

   

          localChange = false;

      }

  }

  
  Hope this helps, if you have any other questions or comments, please let me know,
  
  Best Regards,
  Emanuel Varga
  
  Telerik WinForms MVP

  Reply

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