how to insert y and n in database through checkboxes in a grid using telerik

First and foremost, you might want to check Telrik's forums for assistance on the problem that you are having.

From a 30,000 ft. view it sounds as if you are wanting to store Yes and No Flags into a database. If this is true you will want to know what column types that your database supports that will accommodate this.

Here is a list of some common database engines and data types for each.

EDIT This may require you to store a value representing yes and no. For example if the value is Yes store 1, if No store 0.

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