C#

private void btnAra_Click(object sender, EventArgs e)
    {
        int index = 0;
        String temp = richTextBox1.Text;
            richTextBox1.Text = "";
        richTextBox1.Text = temp;

        while (index < richTextBox1.Text.LastIndexOf(txtAra.Text))
        {
            richTextBox1.Find(txtAra.Text, index, richTextBox1.TextLength, RichTextBoxFinds.None);
            richTextBox1.SelectionBackColor = Color.Orange;
            index = richTextBox1.Text.IndexOf(txtAra.Text, index) + 1;
        }
    }

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
      {

          var str = listBox1.SelectedItem.ToString();
          if (str == "    Yaratılış        Tevrat")
          {
              richTextBox1.Text = str + "\t\r\n\nText here";
          }
          else if (str == "    Mısır'dan Çıkış              (Yasa)")
          {
              richTextBox1.Text = str + "\t\r\n\ncustom text 2";
          }

oPsType.FACId = TxtFACCrbf.Text;
           oPsType.URC = TxtURCCrbf.Text;
           oPsType.PPIDFrom = ddlfromppidcbrf.SelectedValue;
           oPsType.PPIDTo = ddltoppidcbrf.SelectedValue;
           foreach (ListItem item in lblMultiSelect.Items)
           {
               if (item.Selected)
                   oPsType.PAY_TYPE = oPsType.PAY_TYPE + item.Value.ToString();

<pre>
       }

       // Add here for FAC and Payperiod and paytype...right now it is appling only for urc
       PSTYPE[] l = (from PSTYPE thenum in tmppsType
                     where thenum.URCName.Contains(oPsType.URC)
                     &amp;&amp; thenum.FACId.Contains(oPsType.FACId)
                     &amp;&amp; thenum.PAY_TYPE.Contains(oPsType.PAY_TYPE)
                    // &amp;&amp; (int.Parse(thenum.FY_PP) &gt;= int.Parse(oPsType.PPIDFrom) &amp;&amp; int.Parse(thenum.FY_PP) &lt;= int.Parse(oPsType.PPIDTo))
                     select thenum).ToArray();

       PSTypeCollection x = new PSTypeCollection();

       x.AddRange(l);
       // x = ConvertArrayToCollection(l);

       this.GridViewCRBF.DataSource = x;</pre>

private async Task downloadFileAsync(FileEntity file)
{
    try
    {
        using (WebClient client = new WebClient())
        {
            string outputFile = string.Format("{0}{1}", downloadPath, Path.GetFileName(file.FileName));

            if (File.Exists(outputFile))
            {
                File.Delete(outputFile);
            }

            client.DownloadProgressChanged += DownloadProgress(file);
            client.DownloadFileCompleted += DownloadFileCompleted(file);

            await client.DownloadFileTaskAsync(new Uri(file.FileName), outputFile);
        }
    }
    catch (Exception)
    {
        throw;
    }
}

DownloadProgressChangedEventHandler DownloadProgress(FileEntity file)
{
    Action<object, DownloadProgressChangedEventArgs> action = (sender, e) =>
    {
        double bytesIn = double.Parse(e.BytesReceived.ToString());
        double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
        double percentage = bytesIn / totalBytes * 100;

        var _filename = file.FileName;
    };

    return new DownloadProgressChangedEventHandler(action);
}

public AsyncCompletedEventHandler DownloadFileCompleted(FileEntity file)
{
    Action<object, AsyncCompletedEventArgs> action = (sender, e) =>
    {
        var _filename = file.FileName;
    };
    return new AsyncCompletedEventHandler(action);
}

• WebClient.DownloadFileAsync returns void
• WebClient.DownloadFileTaskAsync is awaitable

using System;
namespace DataTypeApplication
{
   class Program 
   {
      static void Main(string[] args)
      {
         Console.WriteLine("Size of int: {0}", sizeof(int));
         Console.ReadLine();
      }
   }
}