temporary store data into the dataset...

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C#3.0

C#

Dear All,
I created a asp.net,C# application that uses Add/update/delete from a sql server 2005 database table. Is there a way for me to temporarily store the data so that my program does not have to repeatedly make server calls for the same set of information. I need the results to be universally available until the program closes.
This is what I have so far and I am not sure where to go next:

public DataTable getsanctioneremail(string company, string locno, string Empcode)
        {
            string sConnString = "";
            sConnString = getConnectionStringForPerdb(company);
            SqlConnection conn = new SqlConnection(sConnString);
            SqlDataAdapter dAd = new SqlDataAdapter();
            SqlCommand dCmd = new SqlCommand("LeaveApp_getSanctionEmail", conn);
            conn.Open();
            dAd.SelectCommand = dCmd;
            dAd.SelectCommand.CommandType = CommandType.StoredProcedure;
            DataSet dSet = new DataSet();
            try
            {
                dCmd.Parameters.AddWithValue("@company", company);
                dCmd.Parameters.AddWithValue("@locno", locno);
                dCmd.Parameters.AddWithValue("@Emp_Num", Empcode);
                dAd.Fill(dSet, "tblgetEmpemail");
                return dSet.Tables["tblgetEmpemail"];
            }
            catch
            { 
                throw;
            }
            finally
            {   dSet.Dispose();
                dAd.Dispose();
                //conn.Close();
                conn.Dispose();   }
        }

if possible please send me the code.
thanks
avijit