Database Gateways

[unixnag]

Hi every one i made a database gateways to access multiple database with Oledb I have made Insert() Select() Delete()

but there is some problem in Update I am giving my Update code and their method of using
but i am not able to decide how user will give fields ant its value and type send foe updation

public void UpdateData(string DatabaseProvider, string DatabaseName, string TableName,Dictionary<string ,string> DC,string Condition)
       {
           string kk = null;
           int i = 0;
           foreach (KeyValuePair<string, string> jj in DC)
           {
               kk = kk + jj.Key + "=" + jj.Value ;
               if (i == DC.Count- 1)
                   continue;
               kk = kk  + ",";
               i++;
           }
           
           string ss = "Use " + DatabaseName + " update " + TableName + " set " + kk + Condition ;
           if (ocon.State == ConnectionState.Closed)
           {
               ocon.Open();
           }
           ocmd = new OleDbCommand(ss, ocon);

           try
           {
              int aa= ocmd.ExecuteNonQuery();
              if (aa >0)
              {
                  MessageBox.Show("Record Successfully Updated");
              }
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }

       }

How To use on button click

ConnectionManager cm = new ConnectionManager("SQL");
            Dictionary<string,string > DC = new Dictionary<string,string>();
            DC.Add("Price", "290");
            DC.Add("High", "80000");
            string condition = " where Symbol = 'CXD'";
            cm.UpdateData("SQL", "info", "TBuyOrder", DC, condition);

but problem is that the dictionary i make it is string type if user input DateTime ,Double,or anyother type then How we Recognize in our function
any one can help me to solve this

Thanks