Need Help--implementing Functions In C#???

Hi y'all I think i have some problem in here perhaps you guys can help.
I have this code:
 1 public void AddQstrWhere(ref string TmpStr,string Parameter)
2 {
3 if(TmpStr=="")
4 {
5 TmpStr +="WHERE"+Parameter;
6 }
7 else
8 {
9 TmpStr +="AND"+Parameter;
10 }
11 }
12
13
14 public string querySlsPerson;
15 //public string queryLastSls;
16 public ArrayList CLSGetSalesman(string szSalesmanID)
17 {
18
19
20 // TODO: Add CLSReportManager.CLSGetSalesman implementation
21 BOSTx Tex = GetTx(CLSReportConstants.TrnMasterID.FQN2,"QueryRptSales");
22 try
23 {
24 string querySalesPerson = "SELECT dbo.BOS_GL_Workplace.WpszState, BOS_PI_Employee_1.szName, dbo.BOS_PI_Employee.szName AS Expr1, dbo.BOS_PI_Employee.szEmployeeId, "+
25 " dbo.BOS_PI_Division.szName AS Divisi, dbo.BOS_PI_Team.szDescription "+
26 " FROM dbo.BOS_PI_Employee LEFT OUTER JOIN "+
27 " dbo.BOS_GL_Workplace ON dbo.BOS_PI_Employee.szWorkplaceId = dbo.BOS_GL_Workplace.szWorkplaceId LEFT OUTER JOIN "+
28 " dbo.BOS_PI_Division ON dbo.BOS_PI_Employee.szDivisionId = dbo.BOS_PI_Division.szDivisionId LEFT OUTER JOIN "+
29 " dbo.BOS_PI_Team ON dbo.BOS_PI_Employee.szTeamId = dbo.BOS_PI_Team.szTeamId LEFT OUTER JOIN "+
30 " dbo.BOS_PI_Employee BOS_PI_Employee_1 ON dbo.BOS_PI_Employee.szSupervisorId = BOS_PI_Employee_1.szEmployeeId ";
31 //"WHERE dbo.BOS_PI_Employee.szEmployeeId = '"+szSalesmanID+"'";
32 //" WHERE BOS_GL_Workplace.WpszState = '" + szProvince + "' AND BOS_PI_Employee.szName = '" + szsalesPrsn + "' AND BOS_PI_Employee_1.szName = '" + szSupervisor + "'";
33
34 string wheretext = " dbo.BOS_PI_Employee.szEmployeeId = '"+szSalesmanID+"'";
35 string queryLastSls;
36 //AddQstrWhere(szSalesmanID,wheretext);
37 if(szSalesmanID==string.Empty)
38 {
39 queryLastSls = querySalesPerson;
40 }
41 else
42 {
43 //string querySlsPerson;
44 AddQstrWhere(ref queryLastSls,wheretext);
45
46 queryLastSls = querySalesPerson + querySlsPerson;
47 }
48
49 OleDbCommand comd = Tex.GetTextCommand();
50 comd.CommandText = queryLastSls;
51
52 DataTable slTable = new DataTable();
53 OleDbDataAdapter adapt = new OleDbDataAdapter(comd);
54 adapt.Fill(slTable);
55
56
57 ArrayList DataSalesArr = new ArrayList();
58 foreach(DataRow row in slTable.Rows)
59 {
60 CSDatasales sls = new CSDatasales();
61 sls.sz_province = row["WpszState"].ToString();
62 sls.sz_supervisorname = row["szName"].ToString();
63 sls.sz_salemanname = row["Expr1"].ToString();
64 sls.sz_salesmancode = row["szEmployeeId"].ToString();
65 sls.sz_Divisi = row["Divisi"].ToString();
66 sls.sz_typeOp = row["szDescription"].ToString();
67
68 DataSalesArr.Add(sls);
69 }
70 Tex.CloseConnection();
71 //AddQstrWhere("",wheretext);
72
73 return (DataSalesArr);
74
75 }
76 catch(Exception ex)
77 {
78 throw ex;
79 }
80
81 }
82 You see I want to make the query more dynamic. So instead of making the SQL parameter permanent I wanna make it dynamic, so the usercan choose whether they want to use the parameter or not. I already declare the parameter which is szSalesmanID. There's a function called AddQStrWhere which can make the query more dynamic. But the thing is when I wanna use the parameter it seems the code doesn't take it, it just use the regular query I dont know why.I already use the function but it just wont work, can you guys tell me what's wrong, Please I really do need some help from you guys, feelin; a lil' bit desperate in here.I appreciate any kinds of help, thanks. FYI: I use Visual Studio.NET 2003, SQL Server 2000.Best Regards.