Telerik RadGrid supports custom edit forms for management of item content. You can switch the type of the edit forms using the GridEditFormType Enumeration.
In the example above the edit form is a WebUserControl specified by the UserControlName property. The same user control will be used for the insert form as well. The user control implements a public DataItem property through which Telerik RadGrid sets the correct values for the editor controls (when loading the user control). This allows the developer to write binding expressions to bind the server controls in the user control to the corresponding DataItem.

Note that WebUserControl custom edit form is not supported with simple data-binding (calling DataBind()). See the Simple data binding demo from the Populating with data section for more info about the limitations of this binding mode.

These documentation topics discuss in detail how to update/insert records using WebUserControl custom edit form:
Updating values with user control edit form
Inserting values with user control edit form
Deleting records