validate checkbox asp.net c#

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

You put validateCheckBoxes_ServerValidate in *.ascx.cs when it should be on ur aspx.cs . On ascx.cs you can't refer the control it is on Parent like this.

put this code to ur aspx.cs file:

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

}

Edit:

Your custom Validator on ascx should seems like:

<asp:CustomValidator id="CustomValidator1" runat="server" ErrorMessage="No checkbox  checked" ControlToValidate="EmailCourse" OnServerValidate="validateCheckBoxes_ServerValidate"/>

without this ControlToValidate attribute server don't know which control u would like to validate.

Edit2:

Did u try to use change <input type="checkbox"/> to <asp:CheckBox />? and tell me how this should be Validate after btn click or after checkbox checked/unchecked?

Edit3:

Check that in your .ascx.designer.cs EmailCourse got proper Type.

Edit4:

When u have <asp:CheckBox .../> on your *.ascx file u should have in your ascx.designer.cs this type protected global::System.Web.UI.WebControls.CheckBox EmailCourse

Please let me know if this help.