How to Build String from Checkbox List

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C#4.0

string

CheckBoxList

I have a search app that has 2 pages and uses a master page. A number of asp.net controls reside on the default page and I need to get their selected values to a label on the results page. I am using a session variable to pass the string built (critString) from the control values to the second page. However with the code below it simply jumps& over the 1st step of the foreach.

public void doStuff()
      {
          var props = new[]{
              "txtFacility", "txtCity", "txtZip",
              "rblFacilityType", "cboSubs", "ddlbCounty",
              "ddlStar", "cblProgramOp", "cblAgeCat",
              "cblTrans"};
          foreach (var v in props)
          {
              if (FindControl(v) != null)
                  {
                      switch (v.Substring(0, 3))
                      {
                          case "cbl":
                              critString += fillcbxl((CheckBoxList)FindControl(v));
                              break;
                          case "ddl":
                              critString += fillddl((DropDownList)FindControl(v));
                              break;
                          case "cbo":
                             critString += fillcbx((CheckBox)FindControl(v));
                              break;
                          case "rbl":
                              critString += fillrbl((RadioButtonList)FindControl(v));
                              break;
                          default:
                              critString += fillTextBox((TextBox)FindControl(v));
                              break;
                      }
                  }
              }
          }

I am not sending the method calls at this time because I can't get to them without getting this to work. I figure it maybe a errant FindControl process given there is a master.page involved. But then it could be that with no checks box selected it evaluates null (noting selected scenario).