Question

link

http://msdn.microsoft.com/en-us/library/ee796239%28v=vs.91%29.aspx#Y3078

the code

return this.ObjectContext.SalesOrderHeaders.OrderBy(e=>e.SalesOrderID);

note

• have done and checked everything done till now is according to the tutorial
• my table is named SERVER,

so something like, the following should work,

return this.ObjectContext.SERVERs.OrderBy(e=>e.username);

prob

Visual Studio 2010 says that there is no “e”.

EDIT THE ERRORS-

Error   13  Cannot convert lambda expression to type 'string' because it is not a delegate type D:\DOCUMENTSS\Visual Studio 2010\Projects\ExampleBusinessApplication\ExampleBusinessApplication.Web\DomainService1.cs   35  55  ExampleBusinessApplication.Web


Error   14  A local variable named 'e' cannot be declared in this scope because it would give a different meaning to 'e', which is already used in a 'parent or current' scope to denote something else D:\DOCUMENTSS\Visual Studio 2010\Projects\ExampleBusinessApplication\ExampleBusinessApplication.Web\DomainService1.cs   35  55  ExampleBusinessApplication.Web

Answer 1

The error message appears to be telling you that e is already defined as something (presumably a string) elsewhere in the scope that contains your return statement. Without seeing your code, I can only conjecture that you have something like this:

method()
{
  string e = "abcd";

  return this.ObjectContext.SERVERs.OrderBy(e=>e.username);
}

That isn’t going to work, because the symbol you’re trying to use as an argument to a lambda expression is already declared.

If you don’t understand the use of => syntax for declaring delegates, you owe it to yourself to figure that out. 🙂 Here’s a tutorial, for example.