How to encode unicode in XLSX sheet ?

A good tool for generating Excel sheet is the EPPlus library, which you can download from here; http://epplus.codeplex.com/[^]

An example;

using System.IO;
// Reference EPPlus.dll
using OfficeOpenXml;

namespace AccessExcelUnicodeTest {
    class Program {
        public static void Main(string[] args) {
            var target = new FileInfo(@"C:\Temp\sheet.xlsx");
            var package = new ExcelPackage(target);
            var sheet = package.Workbook.Worksheets.Add("Content");

            sheet.Cells[1, 1].Value = "Unicode string \u0751\u0752\u0753";

            package.Save();
        }
    }
}

Run that and open C:\Temp\sheet.xlsx and you should see a string containing some Arabic letters.

Hope this helps,
Fredrik