Register Errror in text file

Description :
This code shows how to register error in text file.

Here is the code :

public void RegisterError(Exception ex)
{
	try
	{
		System.Text.StringBuilder strerr= new System.Text.StringBuilder();
	
		strerr.Append("Error Message :"+err);
		strerr.Append("\r\n");
		strerr.Append("Stack Trace :"+ex.StackTrace.ToString());
		string application=System.Web.HttpContext.Current.Request.PhysicalApplicationPath; 
		DirectoryInfo objDir = new DirectoryInfo(application + "/"+"ErrorLog");
		if(!objDir.Exists)
		{
			objDir.Create ();
		}
		FileInfo objFileInfo= new FileInfo(objDir.FullName.ToString()+"/"+"Error.txt");
		if(objFileInfo.Exists==true)
		{
			long lngFileSize=objFileInfo.Length/1024;
			if(lngFileSize>1000)
			{
				objFileInfo.Delete();
			}
		}
		if(objFileInfo.Exists==true)
		{
			objFileInfo.Attributes=FileAttributes.Normal;
			string errFileName=objDir.FullName.ToString()+"/"+"Error.txt";
			FileStream  objFileStream= new FileStream(errFileName,FileMode.Append,FileAccess.Write);
			StreamWriter objStrWriter= new StreamWriter(objFileStream);
			objStrWriter.WriteLine("Error Time:"+ System.DateTime.UtcNow.ToString ());
			objStrWriter.WriteLine(strerr.ToString());
			objStrWriter.Write(objStrWriter.NewLine);
			objStrWriter.AutoFlush=true;
			objStrWriter.Close();
			objStrWriter=null;
		}
	}
	catch(Exception ex)
	{}
}