I had an application that appeared to be working great. However, when I add an EditText (or any other view) to .axml and Activity I receive an InvalidCastException error stating that it cannot convert type ...EditText to ...LinearLayout (or whatever the next view in line happens to be). Can anybody help explain what is going on? It seems like something is off in the Resource.Designer.cs file, but I don't know enough to identify. I cannot figure out what would've changed to no longer allow me to add any more controls to this particular axml/Activity (I am able to add controls to other layouts without issue). I have tried rebuilding and cleaning the solution, but that did not work.