Conversion from HTML to unicode

It depends on exactly what's in your string.

If you paste that string into a C# program, it will give you:

पार्सल् एक्स्प्रेस्

If you then pass that to the System.Net.WebUtility.HtmlDecode function[^], it will return:

पार्सल् एक्स्प्रेस्

which Google translates as:

Colis express

However, if the string comes from an external source, and contains the literal \u0026 characters, then you'll need to decode them first. There are several examples of how to do that in this SO thread:
c# - How do I convert Unicode escape sequences to Unicode characters in a .NET string? - Stack Overflow[^]

For example:

static string Decode(string input)
{
    string html = System.Text.RegularExpressions.Regex.Replace(input, @"\\u[0-9A-F]{4}", match => ((char)int.Parse(match.Value.Substring(2), System.Globalization.NumberStyles.HexNumber)).ToString(), RegexOptions.IgnoreCase);
    return System.Net.WebUtility.HtmlDecode(html);
}

...

string input = @"\u0026#2346;\u0026#2366;\u0026#2352;\u0026#2381;\u0026#2360;\u0026#2354;\u0026#2381; \u0026#2319;\u0026#2325;\u0026#2381;\u0026#2360;\u0026#2381;\u0026#2346;\u0026#2381;\u0026#2352;\u0026#2375;\u0026#2360;\u0026#2381;"
string output = Decode(input);