using System.Text.RegularExpressions;
 /// <summary>
 /// Removes all FONT and SPAN tags, and all Class and Style attributes.
 /// Designed to get rid of non-standard Microsoft Word HTML tags.
 /// </summary>
 public static string CleanMSWordHtml(string html)
 {
     try
     {
         // start by completely removing all unwanted tags
         html = Regex.Replace(html, @"<[/]?(font|span|xml|del|ins|[ovwxp]:\w )[^>]*?>", "", RegexOptions.IgnoreCase);
         // then run another pass over the html (twice), removing unwanted attributes
         html = Regex.Replace(html, @"<([^>]*)(?:class|lang|style|size|face|[ovwxp]:\w )=(?:'[^']*'|""[^""]*""|[^\s>] )([^>]*)>", "<$1$2>", RegexOptions.IgnoreCase);
         html = Regex.Replace(html, @"<([^>]*)(?:class|lang|style|size|face|[ovwxp]:\w )=(?:'[^']*'|""[^""]*""|[^\s>] )([^>]*)>", "<$1$2>", RegexOptions.IgnoreCase);
         return RemoveHTMLComments(html);
     }
     catch
     {
         return html;
     }
 }

 public static string RemoveHTMLComments(string html)
 {
     try
     {
         Regex _Regex = new Regex("((<!-- )((?!<!-- ).)*( -->))(\r\n)*", RegexOptions.Singleline);
         return _Regex.Replace(html, string.Empty);
     }
     catch
     {
         return html;
     }
 }

[a-zA-Z]

[\u0600-\u06FF]
[ا-یءئ]

using System.Text.RegularExpressions;

namespace sample
{
   public static class CDetectFarsi
   {
       public static bool ContainsFarsiData(this string txt)
       {
           return !string.IsNullOrEmpty(txt) &&
                   Regex.IsMatch(txt, "[ا-یءئ]");
       }

       public static bool ContainsFarsi(this string txt)
       {
           return !string.IsNullOrEmpty(txt) &&
                   Regex.IsMatch(txt, @"[\u0600-\u06FF]");
       }
   }
}

using NUnit.Framework;
using sample;

namespace TestLibrary
{
   [TestFixture]
   public class TestFarsiClass
   {
       /*******************************************************************************/
       [Test]
       public void TestContainsFarsi1()
       {
           Assert.IsTrue("وحید".ContainsFarsi());
       }

       [Test]
       public void TestContainsFarsi2()
       {
           Assert.IsTrue("گردان".ContainsFarsi());
       }

       [Test]
       public void TestContainsFarsi3()
       {
           Assert.IsTrue("سپیدTest".ContainsFarsi());
       }

       [Test]
       public void TestContainsFarsi4()
       {
           Assert.IsTrue("123بررسی456".ContainsFarsi());
       }

       [Test]
       public void TestContainsFarsi5()
       {
           Assert.IsFalse("Book".ContainsFarsi());
       }

       [Test]
       public void TestContainsFarsi6()
       {
           Assert.IsTrue("۱۳۸۷".ContainsFarsi());
       }

       [Test]
       public void TestContainsFarsi7()
       {
           Assert.IsFalse("Здравствуйте!".ContainsFarsi()); //Russian hello!
       }

      
       /*******************************************************************************/
       [Test]
       public void TestContainsFarsiData1()
       {
           Assert.IsTrue("وحید".ContainsFarsiData());
       }

       [Test]
       public void TestContainsFarsiData2()
       {
           Assert.IsTrue("گردان".ContainsFarsiData());
       }

       [Test]
       public void TestContainsFarsiData3()
       {
           Assert.IsTrue("سپیدTest".ContainsFarsiData());
       }

       [Test]
       public void TestContainsFarsiData4()
       {
           Assert.IsTrue("123بررسی456".ContainsFarsiData());
       }

       [Test]
       public void TestContainsFarsiData5()
       {
           Assert.IsFalse("Book".ContainsFarsiData());
       }

       [Test]
       public void TestContainsFarsiData6()
       {
           Assert.IsTrue("۱۳۸۷".ContainsFarsiData());
       }

       [Test]
       public void TestContainsFarsiData7()
       {
           Assert.IsFalse("Здравствуйте!".ContainsFarsiData()); //Russian hello!
       }
   }
}

[Test,Ignore]

Test[MethodToBeTested][SomeAttribute]

using System.Reflection;
Assembly.GetExecutingAssembly().Location

new System.EnterpriseServices.Internal.Publish().GacInstall(path);

Assembly.LoadFile(path).GetName().GetPublicKey().Length