C# C# CustomValidator for valid DateTime

[C#] C# CustomValidator for valid DateTime - Printable Version

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+---- Thread: [C#] C# CustomValidator for valid DateTime (/showthread.php?tid=815484)

C# CustomValidator for valid DateTime - ShadowCloud - Nov 13, 2010

Hi Guys

I wasted quite a bit of time on this, so hopefully it will assist someone else:

Add a custom validator and on the properties window just set the ID and ControlToValidate

Then double click and add:

Code 
Boolean valid = new Boolean();

  args.IsValid = ValidateDateTime(valid, source);

Now we need to write the ValidateDateTime function

Code 
protected Boolean ValidateDateTime(Boolean valid, object source)

    {

  DateTime VerifyDate;

  CustomValidator current = (CustomValidator)source;

  TextBox TempControl = (TextBox)FindControl(current.ControlToValidate);

  valid = false;

  try

  {

    VerifyDate = DateTime.Parse(TempControl.Text);

  }

  catch (Exception ex)

  {

    current.ErrorMessage = "Please enter a valid date/time";

    return false;

  }

  if (VerifyDate < DateTime.Today)

  {

    current.ErrorMessage = "The date cannot be in the past";

    return false;

  }

  return true;

    }

This will work as long as you are validating a textbox. The ID of the validator as well as the textbox is dynamically calculated (from source and source.ControlToValidate so there is no need to alter it to make it work :) )

BTW: Here is the markup for an actual custom validator (which uses the above code)

Code 
<asp:CustomValidator ID="ControlID" runat="server" 

    ControlToValidate="ControlToCheck" ErrorMessage="Some message" 

    onservervalidate="ControlID_ServerValidate"></asp:CustomValidator>

(The onservervalidate event will be added when double clicking on the control)

You can also reuse this code for all the validators on the page.