I want to remove space,comma or similar non-ASCI character from string but I didn't.

I tried these but doesn't work.

```
 // my string value = request.ReportName
    Regex.Replace(request.ReportName, @"[^\u0000-\u007F]+", string.Empty);
    Regex.Replace(request.ReportName, @"[^\uxxxx\u0000-\u007F]", string.Empty),

```

By the way I tried this as well but doesn't work as well.

```
System.Text.Encoding.ASCII.GetString(System.Text.Encoding.ASCII.GetBytes(request.ReportName));

```

For example: request.ReportName = "CAption, For long Text double length long to keep"

I want to this : CAptionForlongTextdoublelengthlongtokeep. How can I do ? 
Any idea please.