Concatenating strings in Razor

String.Format also works in Razor:

String.Format("{0} - {1}", Model.address, Model.city)

Use the parentesis syntax of Razor:

@(Model.address + " " + Model.city)

or

@(String.Format("{0} {1}", Model.address, Model.city))

Update: With C# 6 you can also use the $-Notation (officially interpolated strings):

@($"{Model.address} {Model.city}")