Validation on Save and Delete Button

hii guyz,
             I am working on an web application of Report System. I have an Add and Edit Form in it. There are some common button like Add,Edit,Cancel,Delete and Save in the Master page of the Application.
My requirement is that after performing the Manual input on the each of the form (for eg. Add or Edit) i want to perform Save operation on it. I want to perform validation on Save Button to check whether Save shall be performed for ADD Query or Update Query and after save validation is performed then data shall get saved in the database  .
The same case is for Delete Button. I want to validate whether the Role is mapped to previously created User on the Add Form of Creation Roles. If the created Role Exist then it should perform an validation on it.
It will be greatful if you give an sample code for it.

Thanks

Sushant2014!!!