Specified cast is not valid while processing fieldreader

Question

The specified cast not valid occurs when I try to get the fieldreader to datatype int.

_userid is of int type in database

var _fieldReader = sqlCmd.ExecuteReader();

while (_fieldReader.Read())
{
      _userId = _fieldReader.GetInt16(0);
}
sqlCon.Close();

Can anyone please help me with the issue?

Answer 1

If user_id is int type in your database it match with a 32bits integer. Use GetInt32() instead :

 _userId = _fieldReader.GetInt32(0);