What's the use of resource manager class?
The ResourceManager class helps us to read the resource files and get the values by using key. At First you require to create the object of resource manager. You need to specify the resource name & the assembly in the constructor.
private ResourceManager objResourceManager = new ResourceManager("Globalization.resource",System.Reflection.Assembly.GetExecutingAssembly());
Once the resource manager is inhabited with details you can then use the GetString function to get by key. For illustrate in the below code snippet we are using the "cmdAddNew" key to get the value for button "cmdAddNew".
cmdAddNew.Text = objResourceManager.GetString("cmdAddNew");