How to Get selected row value from repeater control

i have no idea to do this... if i am using ItemDatabing it not working properly for me...

i have no idea for this one if i'm using item databound its not working properly

{ if (IsPostBack)
{
string arg = Request["__EVENTARGUMENT"];
if (string.IsNullOrEmpty(arg) == false)
{
if (arg.StartsWith("row"))
{
string v = arg.Substring(arg.IndexOf("#") + 1);
txtSelected.Text = v;
}
}
}
//Have to bind repeater always
con.Open();
string Qry = "select sm.UserIdN,sm.EmpCodeC,sm.empnamec,sm.deptcodec,sm.seccodec,CONVERT(varchar(10),sm.Dojd,103) as Dojd,sm.NricWPNoC,sm.LeaveCodeC,sm.ShiftGroupCodeC,sm.LocationC,CONVERT(varchar(10),sm.TerminateDateD,103)as TerminateDateD,sm.Gender,CONVERT(varchar(10),sm.DOB,103)as DOB,dsm.Privilege,dsm.Password,dsm.Enabled,dsm.CardNumber from StaffMaster sm inner join Device_StaffFP dsm on sm.UserIDN=dsm.UserIDN";
DataTable Dtab = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(Qry, con);
da.Fill(Dtab);
Repeater1.DataSource = Dtab;
Repeater1.DataBind();
}

protected string getPostbackReference(string Name)
{
return ClientScript.GetPostBackEventReference(this, "rowEvent#" + Name);
}

<itemtemplate>
<p önclick="<%# getPostbackReference((string)Container.DataItem) %>">
<%# Container.DataItem %></p>