Build Error

But It does not showing error in ErrorsList

its showing only in runtime how to make the error visible in the error list.

It seems like you're experiencing issues with the build process and missing assembly references when adding a new method in your DAL (Data Access Layer) file. Here are a few steps you can take to resolve the problem:

1. Verify that the necessary assembly references are correctly set up:

   • Make sure that all required DLL files and references are present in your project.
   • Check the references in your DAL and BLL (Business Logic Layer) projects to ensure they are correctly linked.

2. Confirm that the build order is set correctly:

   • In your solution, go to the "Build" menu and select "Project Build Order" (or a similar option).
   • Ensure that the DAL project builds before the BLL project, as the BLL depends on the DAL.

3. Clean and rebuild the solution:

   • Right-click on your solution in Visual Studio and select "Clean Solution."
   • After the clean process completes, right-click on the solution again and select "Rebuild Solution."
   • This will ensure that all projects are rebuilt and any stale or missing references are resolved.

4. Check for any build errors or warnings:

   • Open the "Error List" window in Visual Studio (usually located under the "View" menu).
   • Review any build errors or warnings related to the DAL or BLL projects.
   • Resolve these issues by addressing the specific errors or warnings mentioned.

5. Verify that the updated DLL files are being deployed:

   • Ensure that the updated DLL files for the DAL and BLL projects are being copied to the appropriate location in your application.
   • Check the build settings and ensure that the output directory is correctly configured.

6. Consider using project references instead of DLL references:

   • Instead of referencing the DLL files directly, you can add project references to your solution.
   • Right-click on your solution in Visual Studio, select "Add," and then choose "Existing Project" to add the DAL and BLL projects to your solution.
   • In the referencing project (e.g., the ASPX.cs file), remove the existing DLL references and add references to the projects themselves.

By following these steps, you should be able to resolve the issue of missing DLL references when adding new methods in your DAL file. Remember to clean and rebuild your solution whenever you make changes to ensure all projects are up to date.