c# - 2 properties inside SortExpression -

[resolved], used to answer Ondrej Savjeer's answer.

I'm using:

  & lt; Asp: TemplateField HeaderText = "created by" sortexpress = "User.Firstname" & gt; & Lt; ItemTemplate & gt; & Lt; ASP: Labels ID = "User" runat = "server" text = '& lt;% # bind ("user. Fürstum") & gt; & Lt; / Asp: Label & gt; & Lt; / ItemTemplate & gt; & Lt; / ASP: TemplateField & gt;   
 Which shows on my form like this:  Created by First Name .  
 But I want to show it like this:  Created by First Name  How do I add another string inside "sortexpress" and "text"?   
 
 
 like this:  
  & lt; Asp: TemplateField HeaderText = "Created by" SortXpress = "User. First Name, User.lastname" & gt; & Lt; ItemTemplate & gt; & Lt; Asp: label id = "lblUser" runat = "server" text = '& lt;% # string.format ("{0} {1}", Eval ("user.firstname"), Eval ("User.Lastname" ))% & Gt; '& Gt; & Lt; / Asp: Label & gt; & Lt; / ItemTemplate & gt; & Lt; / ASP: TemplateField & gt;   
 Be careful that by sorting on a number of columns, you can not always give it to you: