How to save file using Dialoguebox in Excellibrary

i am trying to import data from db to excel sheet using excel sheet,its work fine,but problem is that there is a fixed path where i can save a copy,but my requirement is that i have to import multiple sheet base on multiple queries,so i want to use savedialoguebox to save these file with different name and different location,how is it possible?my code is as follow

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string connectionstring = null;

   string sql = null;

                            string data = null;

                          int i = 0;

                          int j = 0;

                            Microsoft.Office.Interop.Excel.Application xlApp;

                           Microsoft.Office.Interop.Excel.Workbook xlWorkBook;

                           Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet;

                           object misValue = System.Reflection.Missing.Value;

                             xlApp = new Microsoft.Office.Interop.Excel.Application();

                          xlWorkBook = xlApp.Workbooks.Add(misValue);

                      xlWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

                            connectionstring = "Data Source=(local);Initial Catalog=Report_Database;integrated security=True";

                           cnn = new SqlConnection(connectionstring);

                          cnn.Open();

      sql = "SELECT * FROM Report_Tab";

                         SqlDataAdapter dscmd = new SqlDataAdapter(sql, cnn);

                       DataSet ds = new DataSet();

                           dscmd.Fill(ds);

                           for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)

                              for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++) {                                  
  data = ds.Tables[0].Rows[i].ItemArray[j].ToString();  
                                  xlWorkSheet.Cells[i + 1, j + 1] = data;    
                            }           
                 }                     
         xlApp.ActiveWorkbook.SaveCopyAs("C:\\Users\\sajid\\Desktop\\test.xls");        
                    xlApp.ActiveWorkbook.Saved = true;                          
  xlApp.Quit();                   
           releaseObject(xlWorkSheet);                  
          releaseObject(xlWorkBook);                   
         releaseObject(xlApp);                           
    MessageBox.Show("Excel file created , you can find the file D:\\Sam-informations.xls");