How do I concatenate 2 resource strings together in an aspx page

ASP.NET tag attribute values that use <%$ Something: Something Else %> are of a special syntax called ASP.NET Expressions. Using them as attribute values are pretty much all-or-nothing; there's no way to add any code into the ASPX file to manipulate what those expressions evaluate to. You'll have to do this in the code-behind.

I search for the solution so long This code works for me:

ToolTip='<%# Resources.Global.Btn_Edit + "/" + Resources.Global.Btn_contact %>'