I have to use Linq to Insert Update Delete in C# windowsform

Hi Ashok,
try this code below

// Query for a specific customer.

var cust =

(from c in db.Customers

where c.CustomerID == "ALFKI"

select c).First();

// Change the name of the contact.

cust.ContactName = "New Contact";

// Create and add a new Order to the Orders collection.

Order ord = new Order { OrderDate = DateTime.Now };

cust.Orders.Add(ord);

// Delete an existing Order.

Order ord0 = cust.Orders[0];

// Removing it from the table also removes it from the Customer's list.

db.Orders.DeleteOnSubmit(ord0);

// Ask the DataContext to save all the changes.

db.SubmitChanges();

My help your