This is the most common problem that generally users face while dealing with Repeater control. I gave this solution in Stackoverflow. want to post it here for users coming from search
Add the below snippet in in template
1CommandArgument='<%#Eval("ScrapId")+","+ Eval("UserId")%>'In code behind you can use retrieve values like this
1protected void GridViews_RowCommand(object sender, GridViewCommandEventArgs e)
2{
3 if (e.CommandName == "Comment")
4 {
5 string[] commandArgs = e.CommandArgument.ToString().Split(new char[] { ',' });
6 string scrapid = commandArgs[0];
7 string uid = commandArgs[1];
8 }
9}