How to update table column using linq to sql

Question

Hi,

 

This is my table :

 

 

 

This is my controller :

 

[HttpGet]
[Route("Read")]
//api/notifications/read
public int ReadNotification(int NotificationId)
{
return _notification.ReadNotification(NotificationId);
} 

 

When I call this controller change the IsRead column is 1

 

Please give me linq to sql query for that.

 

Thank you.