[Solved] Entity Framework Error: property or indexer anynumous type cannot be assigned to-- its read only

Hi sureshMGR,

Anonymous types in C# are immutable and hence do not have property setter methods.

So you can't assign value to them.

You need to select the entity class and set its value to update.

Check this example. Now please take its reference and correct your code.

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    CustomerEntities db = new CustomerEntities();
    Customer customer = db.Customers.Where(a => a.CustomerID == 'ALFKI').Select(c => c).FirstOrDefault();
    customer.ContactName = "Mudassar Khan";
    customer.Country = "India";
    db.SaveChanges();
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim db As CustomerEntities = New CustomerEntities()
    Dim customer As Customer = db.Customers.Where(Function(a) a.CustomerID = "ALFKI"c).Select(Function(c) c).FirstOrDefault()
    customer.ContactName = "Mudassar Khan"
    customer.Country = "India"
    db.SaveChanges()
End Sub