I am getting this error.
Locating source for \'C:\\Users\\cem\\Documents\\Visual Studio 2008\\Projects\\CS.Web.Controls\\WebCropImage\\CropImage.cs\'. Checks
Likely what is happening, is that DLL that you've referenced is throwing an exception when you're calling it. When you're debugging, Visual Studio would like you show you the line of code that is throwing the error, but it doesn't know where the source is. Usually, in my environment, it will prompt you to locate the source file and open it so that it can show you additional debug information. I would usually get the error you mention, when I press cancel on that dialog since I either don't have the source, or don't care what the source is