<File FileVersion=«Версия файла»>
  <Name>Наименование файла </Name>
  <DateTime>Дата изменения</DateTime>
</File>

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using XmlData.FileDBDataSetTableAdapters;
 
namespace XmlData
{
    class DataProvider
    {
        private static FileDBDataSet fileDataSet;
 
        public static FileDBDataSet FileDataSet
        {
            get
            {
                if (fileDataSet == null)
                {
                    fileDataSet = new FileDBDataSet();
                }
                return DataProvider.fileDataSet;
            }
        }
    }
 
    public class XMLDBDataProvider
    {
        private XmlFilesTableAdapter adapter;
 
        public XMLDBDataProvider()
        {
            FileDBDataSet dataset = DataProvider.FileDataSet;
 
            adapter = new XmlFilesTableAdapter();
            adapter.Fill(DataProvider.FileDataSet.XmlFiles);
 
            dataset.XmlFiles.XmlFilesRowChanged += new FileDBDataSet.XmlFilesRowChangeEventHandler(XMLRowModified);
            dataset.XmlFiles.XmlFilesRowDeleted += new FileDBDataSet.XmlFilesRowChangeEventHandler(XMLRowModified);
        }
 
        void XMLRowModified(object sender, FileDBDataSet.XmlFilesRowChangeEvent e)
        {
            adapter.Update(DataProvider.FileDataSet.XmlFiles);
        }
 
        public DataView GetXMLDB()
        {
            return DataProvider.FileDataSet.XmlFiles.DefaultView;
        }
    }
}

<Window x:Class="XmlData.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:XmlData"
        xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit"
        Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
        
    
    <Window.Resources>
        <ObjectDataProvider x:Key="DataProvider" ObjectType="{x:Type local:XMLDBDataProvider}"/>
        <ObjectDataProvider x:Key="XmlFiles" ObjectInstance="{StaticResource DataProvider}" MethodName="GetXMLDB"/>
    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource XmlFiles }}">
        <DataGrid HorizontalAlignment="Left" Margin="73,39,0,0" VerticalAlignment="Top" Height="148" Width="355" ItemsSource="{Binding}"/>
        
    </Grid>
    
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows;

namespace XmlData
{
    class CheckName
    {
        static string filePath = @"C:\Users\Michael\YandexDisk\Projects\data\абв_1234567890_ак45.xml";
        static string filename = System.IO.Path.GetFileNameWithoutExtension(filePath);

        public void isValid()
        {
            string[] fileSplit = filename.Split('_');
            if ((Regex.IsMatch(fileSplit[0], "^[А-Яа-я]+$") & fileSplit[0].Length <= 100) & (Regex.IsMatch(fileSplit[1], @"^\d{1}$|^\d{10}$|^\d{14,20}$")) & (fileSplit[2].Length <= 7))
            {
                MessageBox.Show("Все ок");
            }
            else MessageBox.Show("Bad");
        }
    }
}