my application contain two classes Database & manager class if i try to calling the createDatabase static method of manager class
Object reference not set to an instance of an object error occur.how can solve this problem?
private Database objdb = Manager.CreateDatabase(ConfigurationManager.AppSettings["DBCN"].ToString());
the manager class is as
using System;
using System.Configuration;
public class Manager
{
private Manager()
{
}
public static Database CreateDatabase(string sConnectionString)
{
switch ((ConfigurationSettings.AppSettings["Db"] + "").ToLower())
{
case "oracle":
return new OracleDatabase(sConnectionString);
case "mssql":
return new SqlDatabase(sConnectionString);
}
return null;
}
}