What does "The non-generic type 'System.Web.UI.Pair' cannot be used with type arguments" mean?

 foreach (Pair<Pair<int, int>, Cell> cell in sheet.Cells)
            {
                dgvCells[cell.Left.Right, cell.Left.Left].Value = cell.Right.Value;
            }

I am working on creating a excel file from within .NET, using this Excel Library

I am getting the warning mentioned in the title. Any ideas?

Solution

Just for future reference, and understanding, the error message:

The non-generic type '' cannot be used with type arguments

is replaced with some class, indicates that within your code you are attempting to make use of a non-generic class in a generic way. More specifically you are using some syntax which is incompatible with that type, in this case the <> generic braces on the type "Pair".

To typically solve the problem

Identify the types use within the file, specifically its use in a generic way. (This should find them: Ctrl + F > "SomeClass<")
Ensure that the type is as expected (F12 on the type should take you to its declaration)
If the type is different to the expected type you should make use of a using alias to point to the correct type namespace i.e.
```
using Pair = Fully.Qualified.Namespace.Of.Pair;
```
If the type is as expected ensure that it is generic, if not you can either modify it to be generic, if you have permission/access to do so, or you could select/create a different type which is more suitable for your purpose.
Alternativly you could modify your use of the type to be non-generic