Error asp.net webformapplication in line string price = sdr.GetInt32("Mobile_price").ToString();

Error 1 The best overloaded method match for 'System.Data.Common.DbDataReader.GetInt32(int)' has some invalid arguments

Error 2 Argument1 : cannot convert from 'string' to 'int'

string price = sdr.GetInt32("Mobile_price").ToString();