Stored Procedure To Fill Bridgetable Not Running

I have a table with information about a mobile account in one table, a table for mobile plans, and a table for planfeatures. Each mobile account is associated with a planid, and may be associated with any combination of the features associated with that plan. The plan features are stored in a bridgetable which contains 'invoicedate' (date stamped on the invoice in question), 'subaccountnumber' (the cell phone number), 'planid', and 'featureid'. I've tested the UpdateMobileFeature sp directly from the SQL Profiler--it works fine on it's own. I use a stored procedure to fill the mobile table (called from aspx page), and since I use three of the four columns written above for both the mobilesub and the mobilefeature tables, I tried just adding the parameter which holds the featureid's to the sp to update the mobilesub table. Then I call the UpdateMobileFeature sp from the updatemobile sp. (The code in mobilesub that is not calling UpdateMobileDetail works well). All seems to work fine--nothing crashes or anything, but nothing is being added to the mobilefeature table. Here is the code:CREATE procedure usp_updatemobile(     @InvoiceDate smalldatetime,    @SubaccountNumber varchar(50),    @PlanId int,   @FeatureList varchar(500) --added for UpdateMobileFeatures. In the form of a comma-seperated list, to imitate an array.  --***irrelevant parameters removed***--)

as

exec dbo.UpdateMobileFeature '@InvoiceDate','@SubaccountNumber','@PlanId','@FeatureList' --the apparently nonfunctional call

if exists (    //select for the mobile row in question )  Begin      //update row 

End

Else  Begin   //insert new row End

GOCREATE PROC dbo.UpdateMobileFeatures(  @InvoiceDate smalldatetime, @SubaccountNumber varchar(50),  @PlanID int, @FeatureList varchar(500))ASBEGIN SET NOCOUNT ON

 CREATE TABLE #TempList (  InvoiceDate smalldatetime,  SubaccountNumber varchar(50),  PlanID int,  FeatureID int     )

 DECLARE @FeatureID varchar(10), @Pos int  SET @FeatureList = LTRIM(RTRIM(@FeatureList))+ ',' SET @Pos = CHARINDEX(',', @FeatureList, 1)

 IF REPLACE(@FeatureList, ',', '') <> '' BEGIN  WHILE @Pos > 0  BEGIN   SET @FeatureID = LTRIM(RTRIM(LEFT(@FeatureList, @Pos - 1)))   IF @FeatureID <> ''   BEGIN    INSERT INTO #TempList (InvoiceDate, SubaccountNumber, PlanID, FeatureID)     VALUES (@InvoiceDate, @SubaccountNumber, @PlanID, CAST(@FeatureID AS int)) --Use Appropriate conversion   END   SET @FeatureList = RIGHT(@FeatureList, LEN(@FeatureList) - @Pos)   SET @Pos = CHARINDEX(',', @FeatureList, 1)

  END END 

 --SELECT o.FeatureID, CustomerID, EmployeeID, FeatureDate --FROM  dbo.Features AS o -- JOIN  -- #TempList t -- ON o.FeatureID = t.FeatureID

 

 Insert Into MobileFeatures Select InvoiceDate, SubaccountNumber, PlanID, FeatureID From #TempList  ENDGOHere is the method I used to call the first sp: (also with irrelevant stuff removed)public void saveCurrentMobile()           {

                      calculateTotals();

                      InvoiceDataSet dataset = InvoiceDataSet.GetInstance();

                      SqlConnection conn = (SqlConnection)Session["connection"];

                      SqlCommand cmdUpdateMobile;

                      cmdUpdateMobile = new SqlCommand("usp_updatemobile", conn);                      cmdUpdateMobile.CommandType = CommandType.StoredProcedure;

                      SqlParameter invoicedate = cmdUpdateMobile.Parameters.Add("@InvoiceDate", SqlDbType.SmallDateTime);                      invoicedate.Value = DateTime.Parse(Request.Params["InvoiceDate"].ToString());

                      SqlParameter cellnumber = cmdUpdateMobile.Parameters.Add("@SubaccountNumber", SqlDbType.VarChar, 50);                      cellnumber.Value = txtCellNumber.Text.Trim();

                      SqlParameter plan = cmdUpdateMobile.Parameters.Add("@PlanId", SqlDbType.Int);                      plan.Value = planid;

                      SqlParameter featurelist = cmdUpdateMobile.Parameters.Add("@FeatureList", SqlDbType.VarChar, 500);                      featurelist.Value = planform.FeatureList;

                    

                 //Response.Write(isthirdparty.ToString());                 Response.Write(thirdpartycompany);

                      SqlParameter cycle = cmdUpdateMobile.Parameters.Add("@Cycle", SqlDbType.Int);                      cycle.Value = Convert.ToInt32(Request.Params["Cycle"]);

                      int returnvalue = runStoredProcedure(cmdUpdateMobile); //the sp is called within this method.

 

                      if (returnvalue != 0)                      {                          dataset.fillMobileTable();                         Response.Write("Mobile Subaccount Saved!");                      }           }