Error - Unhandled exception

Hi,

The error you're encountering is related to the requirement for jQuery when using Unobtrusive Validation in ASP.NET WebForms. By default, ASP.NET WebForms uses unobtrusive validation, which depends on jQuery. If jQuery is not available on the page, you'll get the error message:

WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).

Solution
To resolve this issue, you can add a ScriptResourceMapping for jQuery in your Global.asax file, or directly include jQuery in your ASP.NET WebForm.

1. Adding ScriptResourceMapping in Global.asax:
Open your Global.asax file and add the following code in the Application_Start method:

protected void Application_Start(object sender, EventArgs e)
{
       
    ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition
    {
        Path = "~/Scripts/jquery-3.6.0.min.js",  // Adjust the path to your jQuery version
        DebugPath = "~/Scripts/jquery-3.6.0.js", // Adjust the path to your jQuery version
        CdnPath = "https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js",
        CdnDebugPath = "https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.js",
        CdnSupportsSecureConnection = true,
        LoadSuccessExpression = "window.jQuery"
    });
}

Make sure that the path specified in Path and DebugPath matches the location of your jQuery files in your project.

2. Including jQuery Directly in the WebForm:
Alternatively, you can include jQuery directly in your ASPX page by adding a

This ensures that jQuery is available for unobtrusive validation to function correctly.

3. Disable Unobtrusive Validation (Optional):
If you prefer to disable unobtrusive validation entirely, you can add the following to your Web.config file:

This will revert to the older validation method that doesn't require jQuery, but it's generally recommended to use unobtrusive validation for better performance and cleaner markup.

Conclusion
To fix the error, you can either add the ScriptResourceMapping for jQuery, include the jQuery library directly in your page, or disable unobtrusive validation. The first two options are recommended as they maintain the advantages of unobtrusive validation.

The error you're encountering is due to the fact that your ASP.NET Web Forms application is set to use unobtrusive validation, which requires jQuery. However, jQuery is not currently mapped in your project, leading to the exception.

Here are steps to resolve this issue:

1. Add jQuery Script Mapping

You need to add a ScriptResourceMapping for jQuery in your Global.asax.cs file or directly in your ASP.NET page. Here's how you can do it:

In Global.asax.cs:

protected void Application_Start(object sender, EventArgs e)
{
    ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition
    {
        Path = "~/Scripts/jquery-3.6.0.min.js", // Update the path based on where jQuery is located in your project
        DebugPath = "~/Scripts/jquery-3.6.0.js",
        CdnPath = "https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.6.0.min.js",
        CdnDebugPath = "https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.6.0.js"
    });
}

 

2. Include jQuery Script in Your Page

Alternatively, you can directly include the jQuery script in your ASP.NET page. For example, in your Department.aspx page:

3. Check Web.config

Ensure that unobtrusive validation is enabled in your Web.config:

4. Make Sure jQuery Is Correctly Loaded

Ensure that jQuery is properly loaded by opening your page in a browser, inspecting the page source, and checking the console for any errors related to jQuery.

5. Disable Unobtrusive Validation (Optional)

If you don't need unobtrusive validation, you can disable it by modifying your Web.config:

This change will revert to the old-style validation that doesn't require jQuery.

After making these changes, your regular expression validator should work without throwing the exception.