Actually this text box value takes only string variables
in_System1URL is a string
“/work-items/”- when yo are putting in quotes means a string value
however in_WIID is a Int32 or a integer type
So to use that as string you have to do in_WIID.ToString
You will have in_System1URL+“/work-items/”+in_WIID.ToString
[When you will put a . it will automatically give you the method options and then you can select toString]