I have a DataSet called Reporting that include TagName, Value and DateTime.

Now my question: In my SSRS Report I have a TextBox where I want the Value of a TagName.

For Example: I have TagName called: `"TT101"` with the Value `21`.

So my TextBox should show `21`.

I have tried with this expression:

```
=IIf(Fields!TagName.Value = "TT101" , Fields!Value.Value ,0)

```

So I expected the output this expression to be `21` but it was `0` because it's always `false` or `Null` and I can't find out why?