int shetcount = ExcApp.Worksheets.Count;
            for (int i = 1; i <= shetcount; i++)
            {
                Excel.Worksheet sheet = (Excel.Worksheet)ExcApp.Worksheets.get_Item(i);
            }

Excel.Worksheet sheet = (Excel.Worksheet)ExcApp.Worksheets.get_Item(i);

string sUserName = Page.User.Identity.Name;

WindowsPrincipal wpMain = new WindowsPrincipal(WindowsIdentity.GetCurrent());
string sUserName = wpMain.Identity.Name;

<authentication mode="Windows"></authentication>

ldifde -f portal_SPN.txt -t 3268 -d "" -l servicePrincipalName -r "(servicePrincipalName=HTTP/portal*)" -p subtree

var query =
            from c in context.GetLD_PravaQuery()
            from d in context.GetLD_DataQuery() 
            where d.idLD_Data == c.LD_Data_idLD_Data
            select c;
// пишет что не найден join
var query =
            from c in context.GetLD_PravaQuery()
            join d in context.GetLD_DataQuery()
            on d.idLD_Data equals c.LD_Data_idLD_Data
            select c;
// пишет что не найден SelectMany

spec_view.Rows[0].Cells["contract_Name"].Value = "ffff";

tabControl2.SelectedTab = tabPage7; //таб со spec_view
spec_view.Rows[0].Cells["contract_Name"].Value = "ffff";