C# Обработываем событие на Hotkey в приложениях WPF

Способ 1

        public MainWindow()
        {
            InitializeComponent();
            AddHandler(Keyboard.KeyDownEvent, (KeyEventHandler)HandleKeyDownEvent);
        }

        private void HandleKeyDownEvent(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Tab && (Keyboard.Modifiers & (ModifierKeys.Control | ModifierKeys.Shift)) == (ModifierKeys.Control | ModifierKeys.Shift))
            {
                MessageBox.Show("CTRL + SHIFT + TAB trapped");
            }

            if (e.Key == Key.Tab && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
            {
                MessageBox.Show("CTRL + TAB trapped");
            }
        }

Способ 2

<Window x:Class="WPFHotkey.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WPFHotkey"
        Title="MainWindow" Height="350" Width="525">
    <Window.CommandBindings>
        <CommandBinding Command="local:MainWindow.Some_Command" Executed="Some_Executed"/>
    </Window.CommandBindings>
    <Window.InputBindings>
        <KeyBinding Key="F4" Modifiers="ALT" Command="local:MainWindow.Some_Command"/>
    </Window.InputBindings>
    <Grid>
        
    </Grid>
</Window>

using System.Windows;
using System.Windows.Input;

namespace WPFHotkey
{
    
    public partial class MainWindow : Window
    {
        public static RoutedCommand Some_Command = new RoutedCommand();


        private void Some_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show("Hi!");
        }

        public MainWindow()
        {
            InitializeComponent();
        }

    }
}

c# проверяем xml по xsd схеме

using System;
using System.Xml;
using System.Xml.Schema;
using System.IO;

public class Sample {

  public static void Main() {

    XmlSchemaSet sc = new XmlSchemaSet();
    sc.Add("", "books.xsd");
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.ValidationType = ValidationType.Schema;
    settings.Schemas = sc;
    settings.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
    XmlReader reader = XmlReader.Create("booksSchemaFail.xml", settings);
    while (reader.Read());

  }

  private static void ValidationCallBack(object sender, ValidationEventArgs e) {
    Console.WriteLine("Validation Error: {0}", e.Message);
  }
}

C# How to work with Excel. Simple example.

using Excel = Microsoft.Office.Interop.Excel; 
        
void CreateExcel()
        {
            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.Application();//new Excel.ApplicationClass();
            xlWorkBook = xlApp.Workbooks.Add(misValue);

            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);


            int i = 3;
            int j = 0;
            xlWorkSheet.Cells[1, 1] = "Protocol from " + DateTime.Now.ToShortDateString();
            Excel.Range rg = (Excel.Range)xlWorkSheet.Cells[1, 1];
            rg.EntireColumn.NumberFormat = "MM/DD/YYYY";

            xlWorkSheet.Columns.AutoFit();
                
            xlWorkBook.SaveAs("sdfgsdfg.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, Excel.XlSaveConflictResolution.xlLocalSessionChanges, misValue, misValue, misValue, misValue);
            xlWorkBook.Close(true, misValue, misValue);
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
            }
            finally
            {
                GC.Collect();
            }
        }