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  Private Sub cmdReset_Click(ByVal sender As System.Object, ByVal e As
   System.EventArgs) Handles cmdReset.Click
  
   Dim frm As Control = Me.FindControl("YourFormName") 'is the HTML
   form Id
  
   For Each ctrl As Control In frm.Controls
   If TypeOf ctrl Is CheckBox Then
       if DirectCast(ctrl, CheckBox).Checked = true
           'do what you want to do here
       end if
   End If
   Next
  end sub 

  
  
  

  • Edited by Rbie Monday, March 16, 2015 9:24 AM
  • Proposed as answer by Cor Ligthert Monday, March 16, 2015 9:59 AM
  • Marked as answer by Just Karl Wednesday, March 25, 2015 4:59 PM

  Monday, March 16, 2015 9:23 AM
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  Hi and thanks for the reply

  When i try I got this messages.

  Server Error in '/' Application.

  ---

  Object reference not set to an instance of an object.

  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.           
  
  Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
  
  Source Error:

  Line 25: Dim frm As Control = Me.FindControl("form1") 'is the HTML Form(ID) Line 26: Line 27: For Each ctrl As Control In frm.Controls Line 28: If TypeOf ctrl Is CheckBox Then Line 29: If DirectCast(ctrl, CheckBox).Checked = True Then

  does it matter that I have a master page?

  The form is in the master page also.

  formid="form1"runat="server">

  <divclass="ContentPlaceHolder1">

  <asp:ContentPlaceHolderid="ContentPlaceHolder1"runat="server">

  </asp:ContentPlaceHolder>

  </div>

  </form>

  BR

  Falken100

  • Edited by Falken100 Monday, March 16, 2015 12:58 PM

  Monday, March 16, 2015 10:04 AM
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  Hi Falken100,

  As your issue is related to ASP.net, I suggest you posting it to asp.net forum for supports. Thanks for your understanding.

  http://forums.asp.net

  Best regards,
  Youjun Tang

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  • Marked as answer by Just Karl Wednesday, March 25, 2015 4:59 PM

  Tuesday, March 17, 2015 9:59 AM