Question

I am trying to validate two checkboxes. One of them must be checked in order for the form to be valid. I would like to use a CustomValidator control, and validate on the server.

(This .ascx page is a form that is displayed on a different .aspx page.)

First I put in the checkboxes and a CustomValidator control on my .ascx page. Like this:

<tr>
        <td colspan="3">
            <input type="checkbox" runat="server" name="EmailCourse" class="" id="EmailCourse" value="" />
                Email course
<asp:CustomValidator id="CustomValidator1" runat="server" ErrorMessage="No checkbox checked" 
                 OnServerValidate="validateCheckBoxes_ServerValidate">
                </asp:CustomValidator>

        </td>
    </tr>
<tr>
        <td colspan="3">
            <input type="checkbox" runat="server" name="SpecialReport" class="" id="SpecialReport"  value="" />
                Special report
        </td>
    </tr>

Then, I added the validateCheckBoxes_ServerValidate function in the code-behind, on the .ascx.cs page, like this:

            protected void validateCheckBoxes_ServerValidate(object source, ServerValidateEventArgs args)
        {
            if (!EmailCourse.Checked && !SpecialReport.Checked)
                args.IsValid = false;
            else
                args.IsValid = true;

    }

When I try to open the page that uses this form on my local site to see what it looks like, I get an error, like this:

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: ‘ASP.common_controls_specialreportform_ascx’ does not contain a definition for ‘validateCheckBoxes_ServerValidate’ and no extension method ‘validateCheckBoxes_ServerValidate’ accepting a first argument of type
‘ASP.common_controls_specialreportform_ascx’ could be found (are you missing a using directive or an assembly reference?)

And:

error CS1061: ‘ASP.common_controls_specialreportform_ascx’ does not contain a definition for ‘validateCheckBoxes_ServerValidate’ and no extension method ‘validateCheckBoxes_ServerValidate’ accepting a first argument of type ‘ASP.common_controls_specialreportform_ascx’ could be found (are you missing a using directive or an assembly reference?)

Does anyone know what the cause of this error is? I’m new at asp.net and am having trouble with this.

Thanks!

Answer 1

OK. So here’s what worked:

As harry180 suggested, I did need to switch the input-type=”CheckBox” to asp:CheckBox.

This triggered a run-time error, which I commented about above. The run-time error was because I had not recompiled the solution after making the change, in order that the ascs.designer.cs file be modified.

After recompiling, the code works.