C#

PrintDialog printDia = new PrintDialog();
printDia.PrinterSettings = new PrinterSettings();
DialogResult result = printDia.ShowDialog();
StringBuilder sb = new StringBuilder();
        sb.AppendLine("<STX><ESC>A");
        sb.AppendLine("<ESC>H0001<ESC>V0001<ESC>XM45676567");
        sb.AppendLine("<ESC>Q1");
        sb.AppendLine("<ESC>Z<ETX>")
String output = sb.ToString().Replace("<ESC>", ((char)27).ToString());
        output.Replace("<STX>",((char)2).ToString());
        output.Replace("<ETX>", ((char)3).ToString());
if (result == DialogResult.OK)
        {
            RawPrinterHelper.SendStringToPrinter(printDia.PrinterSettings.PrinterName, output);
        }

private byte[] Serialize(T obj)
{
    using (var memoryStream = new MemoryStream())
    {
        oBinaryFormatter.Serialize(memoryStream, obj);

        return memoryStream.ToArray();
    }
}

oBinaryFormatter.Serialize(memoryStream, 300MbObject);

public MI_PhotoAlbum POSTImageUpload(FacebookRegistrationModel model)
      {
          var userTable = new MI_PhotoAlbum();
         ().Query().Get().Where(a => a.UserId == model.UserID).SingleOrDefault();

          
              userTable.UserId = model.UserID;
              userTable.ImageUrl = model.Avatar;


              _unitOfWork.Repository<MI_PhotoAlbum>().Insert(userTable);
              _unitOfWork.Save();
         
          return userTable;

      }

<div class="photo-upload-bar">
                  <i class="fa fa-image"></i>Photos<div class="btn btn-primary btn-xs pull-right btn-upload" >Upload <i class="fa fa-plus"></i>
                <input id="choose" type='file' name="fileUpload" onchange="readfile(this);" accept="image/x-png, image/gif, image/jpeg" /></div>

                     @* <label class="control-label col-md-2">Image</label>*@
                      <div class="col-md-10">
                          <img id="image_preview" src="~/Areas/Admin/Images/NoImage/NO_IMAGE.jpg" alt="your image" width="100" height="100" />
                          <input id="RemoveBtnID" style="display: none" type="button" value="Remove" onclick="Removefun()" />
                          @*<input id="choose" type='file' name="fileUpload" onchange="readfile(this);" accept="image/x-png, image/gif, image/jpeg" />*@
                          <span id="para" style="color: red"></span>&nbsp;
                          <span id="SpanImageId" style="color: red;"></span>
                          <br />
                     <span id="SpanimageId" style="color: red;"></span>
                      </div>

<script type="text/javascript">
    jQuery(document).ready(function () {
        ComponentsEditors.init();
    });
    var url = window.URL || window.webkitURL;
    $('#choose').change(function () {
        alert("hii");
    var newInterests = $("#choose").val();
       if (newInterests != "") {
          $.ajax({
                url: "../account/multipleimageupload/?image=" + newInterests,
                type: "Post",
               contentType: 'application/json; charset=utf-8',
                success: function (data) {
                    if (data != 0) {
                        //jq("#tagsTextbox").tokenInput("add", { id: data, name: newInterests });
                        //j1("#customTags").val("");
                        //jq("#customTags").focus();
                    }
                    else {
                        //alert("already exists");
                    }
                },
                error: function () { }
            });
        }
        else {
            //alert(" Interest is required");
        }

        var fileExtension = ['jpeg', 'jpg', 'png', 'gif', 'bmp'];
        if ($.inArray($(this).val().split('.').pop().toLowerCase(), fileExtension) == -1) {
            document.getElementById('para').innerHTML = "<span>Choose Only Image Files</span>";
            Removefun();
            //alert($(this).val());
            document.getElementById('Upload').innerHTML = "<span></span>";
            $('#choose').val('');
            $('#image_preview').attr('src', "/Areas/Admin/Images/NoImage/NO_IMAGE_Thumb.jpg");

            return false;
        }
        else {
            $("#SpanimageId").text("");
            document.getElementById('para').innerHTML = "<span></span>";
            document.getElementById('Upload').innerHTML = "<span></span>";
        }
    });
    function readfile(input) {
        if (input.files && input.files[0]) {
            var reader = new FileReader();
            reader.onload = function (e) {
                $('#image_preview').attr('src', e.target.result);
                var imagesize = input.files[0].size / 2048;
                var ImageSize = imagesize / 2048;
                if (ImageSize > 2) {
                    alert("Image size should be less than 2MB");
                    $('#image_preview').attr('src', "/Areas/Admin/Images/NoImage/NO_IMAGE_Thumb.jpg");
                    $('#RemoveBtnID').hide();
                    $('#choose').show();
                    //$('#choose').val("");
                    return false;
                }
                else {
                    $('#RemoveBtnID').show();
                    //$('#choose').hide();
                    $("#SpanimageId").text("");
                }
            }
            reader.readAsDataURL(input.files[0]);
        }
    }
    function Removefun() {
        $('#image_preview').attr('src', "/Areas/Admin/Images/NoImage/NO_IMAGE.jpg");
        $('#RemoveBtnID').hide();
        $('#choose').show();
        //$('#choose').val("");
    }

</script>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using IWshRuntimeLibrary;

namespace test
{
    public partial class TestFileDelete : Form
    {
        Boolean flag = true;

        public TestFileDelete()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // disables while running click code
            this.button1.Enabled = false;

            // This doesnt seem to do anything either?
            if (this.button1.Enabled == false) return;

            // just a either or flag to swtich the end of the shortcut names to see if they are deleted or not with one button
            int switchnum = (flag) ? 1 : 0;
            int newnum = (flag) ? 0 : 1;
            if (flag == true)
            {
                flag = false;
            }
            else
            {
                flag = true;
            }

            // this is a bit messy, its taken from my larger project. but this code shows my problem. (in fact my larger project only requires a 200ms timeout, this needs 300..?)
            String StartMenuProgName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonStartMenu), "Programs", "skbt config", "config " + newnum);

            Dictionary<UInt32, String> Shortcuts = new Dictionary<uint, string>() {
                        {0,Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Start Keepalive (" + "config " + newnum + ").lnk")},
                        {1,Path.Combine(StartMenuProgName, "Start Keepalive.lnk")},
                        {2,Path.Combine(StartMenuProgName, "Auto Restart Test.lnk")},
                        {3,Path.Combine(StartMenuProgName, "Manual Restart.lnk")},
                        {4,Path.Combine(StartMenuProgName, "Manual Start.lnk")},
                        {5,Path.Combine(StartMenuProgName, "Manual Stop.lnk")},
                        {6,Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "README.txt")}
                    };
            foreach (KeyValuePair<UInt32, String> shortcut in Shortcuts)
            {
                while (System.IO.File.Exists(Path.GetFullPath(shortcut.Value.ToString())))
                {
                    // Will only delete with a delay of at least 300 ms.????
                    if (this.checkBox1.Checked == true)
                    {
                        Thread.Sleep(300);
                    }
                    System.IO.File.Delete(Path.GetFullPath(shortcut.Value.ToString()));
                }
            }
            if (Directory.Exists(StartMenuProgName)) { Directory.Delete(StartMenuProgName, true); }

            // Current Name
            StartMenuProgName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonStartMenu), "Programs", "skbt config", "config " + switchnum);

            // Create Shortcuts on desktop / add to programs start menu
            String BatchLibPath = @"c:\test";

            if (!addShortcut(
                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Start Keepalive (" + "config " + switchnum + ").lnk"),
                Path.Combine(BatchLibPath, "start_keepalive.bat")))
            {
                MessageBox.Show("There was an error creating a shortcut in the Start Menu (0).");
            }

            if (!addShortcut(
                Path.Combine(StartMenuProgName, "Start Keepalive.lnk"),
                Path.Combine(BatchLibPath, "start_keepalive.bat")))
            {
                MessageBox.Show("There was an error creating a shortcut in the Start Menu (1).");
            }

            if (!addShortcut(
                Path.Combine(StartMenuProgName, "Auto Restart Test.lnk"),
                Path.Combine(BatchLibPath, "control", "auto_restart.bat")))
            {
                MessageBox.Show("There was an error creating a shortcut in the Start Menu (2).");
            }

            if (!addShortcut(
                Path.Combine(StartMenuProgName, "Manual Restart.lnk"),
                Path.Combine(BatchLibPath, "control", "manual_restart.bat")))
            {
                MessageBox.Show("There was an error creating a shortcut in the Start Menu (3).");
            }

            if (!addShortcut(
                Path.Combine(StartMenuProgName, "Manual Start.lnk"),
                Path.Combine(BatchLibPath, "control", "manual_start.bat")))
            {
                MessageBox.Show("There was an error creating a shortcut in the Start Menu (4).");
            }

            if (!addShortcut(
                Path.Combine(StartMenuProgName, "Manual Stop.lnk"),
                Path.Combine(BatchLibPath, "control", "manual_stop.bat")))
            {
                MessageBox.Show("There was an error creating a shortcut in the Start Menu (5).");
            }
            this.button1.Enabled = true;
        }

        private static Boolean addShortcut(String ShortcutPath, String TargetPath)
        {
            try
            {
                WshShell shell = new WshShell();
                IWshShortcut link = (IWshShortcut)shell.CreateShortcut(ShortcutPath);
                link.TargetPath = TargetPath;

                if (!Directory.Exists(Path.GetDirectoryName(ShortcutPath)))
                {
                    Directory.CreateDirectory(Path.GetDirectoryName(ShortcutPath));
                }
                link.Save();

                return true;
            }
            catch
            {
                return false;
            }
        }

        // Does Nothing when used in that loop.
        protected virtual bool IsFileLocked(FileInfo file)
        {
            FileStream stream = null;

            try
            {
                stream = file.Open(FileMode.Open, FileAccess.ReadWrite, FileShare.None);
            }
            catch (IOException)
            {
                //the file is unavailable because it is:
                //still being written to
                //or being processed by another thread
                //or does not exist (has already been processed)
                return true;
            }
            finally
            {
                if (stream != null)
                    stream.Close();
            }

            //file is not locked
            return false;
        }
    }
}

x => x.MyCollection.Select(y => y.SomeInt)

<asp:DataGrid runat="server" CssClass="tblResults" OnItemDataBound="dgList_ItemCreated" OnRowDataBound="OnRowDataBound" AllowSorting="true" OnSortCommand="dgTrailer_Sort" ID="dgTrailers" DataKeyField="ID" AutoGenerateColumns="false">
            <Columns>
                <asp:BoundColumn DataField="TrailerOwner" HeaderText="Owner" SortExpression="TrailerOwner"></asp:BoundColumn>
                <asp:BoundColumn DataField="TrailerMake" HeaderText="Trailer Make" SortExpression="TrailerMake"></asp:BoundColumn>
                <asp:TemplateColumn HeaderText="Trailer Location">
                    <itemtemplate>
                        <asp:DropDownList ID="ddlLocation" runat="server">
                        </asp:DropDownList>
                 </itemtemplate>
                </asp:TemplateColumn>
                </Columns>
        </asp:DataGrid>

protected void PopulateDDLs()
{
    DataSet dsTrailerLocation = DataUtils.GetAllGenSmall(Company.Current.CompanyID, "Description", "", 1, false, "Description", false, "TrailerLocationNOCODE", 0);
    if (dsTrailerLocation.Tables[0].Rows.Count > 0)
    {
        ddlTrailerLocation.DataSource = dsTrailerLocation;
        ddlTrailerLocation.DataValueField = "Description";
        ddlTrailerLocation.DataTextField = "Description";
        ddlTrailerLocation.DataBind();
        ddlTrailerLocation.Items.Insert(0, new ListItem("Select One", "0"));
    }
    else
    {
        ddlTrailerLocation.Items.Insert(0, new ListItem("No Locations Entered", "0"));
    }
}

I can’t download and use official telegram api in c# to create chat program.
I need steep-by-steep tutorial to do this. And may be one little sample program in c#.