How to pass Database Field Name to SQLDataReader GetString Function

How to retrieve data from SQLDataReader using FieldNames in C# (.NET)

It is always better practice to use Field names instead of Index. You can decide which of the following is clear

string sPlayerName =  rdr[1].ToString();
             sPlayerName = rdr["PlayerFirstName"].ToString();

The best overloaded method match for 'System.Data.Common.DbDataReader.GetString(int)' has some invalid arguments

SQLDataReader - Invalid attempt to read when no data is present

The error occurs when there no data is returned / the data has not been read.

The first case can be checked using HasRows flag

If the data is not read it can be done as follows:

SqlDataReader rdr = Cmd.ExecuteReader();

            while (rdr.Read() == true)
            {
              string sName =  rdr.GetString(1);
            }
      

SQLDataReader - Invalid attempt to read when no data is present