Hello again, Happy Peoples

Working on a webpage (asp) in the code behind and I go to run the page to test the latest code added:

    string SearchString = Request.QueryString["SearchString"].ToString();
    if (SearchString.Length != 0)
    {
      if (SearchString.IndexOf(":") > 0)
      {
        string[] vs = SearchString.Split(':');
        GetAccessInfo(vs[0]);
        Session["NewEdit"] = false;
      }
      else
        GetAccessInfo(SearchString);
      Session["NewEdit"] = false;
    }
    else
      Session["NewEdit"] = true;

Now, the VS editor shows no problems - but when I go to run it, I get the "There were errors" Msg window and in the Output box it shows:

"...\ARDetails.aspx.cs(201,88): error CS1525: Invalid expression term ':' "
"...\ARDetails.aspx.cs(201,89): error CS1002: ; expected "
"...\ARDetails.aspx.cs(201,92): error CS1002: ; expected "
"...\ARDetails.aspx.cs(201,92): error CS1525: Invalid expression term ':' "

I hit 'No' so it will show me where the errors are, and the Error List shows "0 Errors", "0 Warnings", and 5 Messages where is wants to simplify object initialization (but when I take its advice and make the suggested change, it then pops up with an error on that change, so I ignore them).

I commented out the new code to see if that cleared the issue, it didn't - which means it's suddenly jumping up and down on code that's been running for a month (at least)

What's going on? Can anyone point me in a direction that will lead me to whatever's causing this?

Thanks all