Data Reader to DataTable Copy the Rcore

Without seeing your code, I can only make an educated guess:
Are you doing this:

SqlDataReader reader = cmd.ExecuteReader();
DataTable dt = new DataTable();
if (reader.Read())
    {
    dt.Load(reader);
    }

Because, if you are, that's your problem: the Read method removes one of the records from the list...


"this code is run succesfully but top record is missing"


Yes - the Read() method call removes the first record. Don't call Read. Instead, check reader.HasRows[^]


"but any option to send data into datatable from datareader"


Try:

SqlDataReader reader = cmd.ExecuteReader();
DataTable dt = new DataTable();
if (reader.HasRows)
    {
    dt.Load(reader);
    }