checked items in repeater

try
{
DataTable dtData = new DataTable();
int a = dtData.Rows.Count;
// ViewState["Data"] = dtData;
dtData = (DataTable)ViewState["CurrentPos"];

DataTable dtResult = (DataTable)ViewState["Data"];


for (int i = 0; i < Rpt_Company.Items.Count; i++)
{

CheckBox ch = ((CheckBox)Rpt_Company.Items[i].FindControl("chkbox"));
if (ch.Checked == true)
{
string[] memberno = { "1002", "1003", "1006" };

// DataRow dr = dtData.NewRow();

//var memberno=from memberno in
//dr["Companyname"] = ((Label)Rpt_Company.Items[i].FindControl("Lbl_title1")).Text;

//CheckBox cbxIsActive = item.FindControl("chkbox") as CheckBox;
//HiddenField hdfID = item.FindControl("recordID") as HiddenField;




}


}

This only i have tried so far...I dont know how to call the member no for each row in the repeater control....loop condition..Please help me