How select values from checkbox list in C# asp.net

Hi,

I Have a search application in which contains the checkbox list of projects and text boxes for each projects with start date and end date, checklist items are binding dynamically from the databse, if there more projects then there are more checkboxes coming, while selecting all check boxes and searching the item(Search Button is there) then there is lots of round trip process is going on(3-Tier Application) which taking lots of time to fill the grid control, Is there any process to send the whole checkbox list's data and text boxe's data into database(Stored procedure) in single roundtrip and fetch records.
Customer List:Customer 1 StartDateTextBox EndatedateTextBox
  Customer 2 StartDateTextBox EndatedateTextBox
  Customer 3 StartDateTextBox EndatedateTextBox
  Customer 4 StartDateTextBox EndatedateTextBox
  Customer 5 StartDateTextBox EndatedateTextBox
  Customer 6 StartDateTextBox EndatedateTextBox
  Customer 7 StartDateTextBox EndatedateTextBox
Button Search
GridVew Result:





Here is the code which I am using currently
if (lbxProjectList.Items[i].Selected.Equals(true))
                    {

                        EmployeeBillingService gs = new EmployeeBillingService(this.ContextBO);

                        List gList = gs.GetEmployeeProjectDetails(Convert.ToInt32(ddlCustomerList.SelectedValue), Convert.ToInt32(lbxProjectList.Items[i].Value), Convert.ToDateTime(Session["DtStartDate"]), Convert.ToDateTime(Session["DtEndDate"]));
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