How to bind several data (more then 7300) to datagrid

Hello,

I am trying to  bind to datagrid several data. I created an observablecollection, i stocked data into this collection and then i binded this collection to my datagrid. In xaml file i declared my datacontext. When i did it my visual studio and all application on my computer clock. I can't do anything. A simple think that i can do, is to close session and restart .

I need help.

Here is some sample:

code cs ViewModel:

using System;
using System.Collections.Generic;

using System.Text;
using GestionDeContrats_Offres_ClientsGUI.VueModele;
using System.Collections.ObjectModel;
using System.Windows.Data;
using System.ComponentModel;
using GestionDeContrats_Offres_Clients.GestionOffres;
using GestionDeContrats_Offres_Clients.GestionContrats;
using System.Windows.Input;
using GestionDeContrats_Offres_Clients.GestionModele;
using GestionDeContrats_Offres_ClientsGUI.crm;
using System.Data;

namespace GestionDeContrats_Offres_ClientsGUI.VueModele
{
    /// <summary>
    ///
    /// </summary>
   public class GestionDeContratVueModele : VueModeleBase
    {

        private readonly ObservableCollection<ContratVueModele> contrats;
    
        private readonly PagingCollectionView pagingView;
        private GestionDeContrat gestiondecontrat;
       
       


       /// <summary>
       /// Constructeur de la classe
       /// GestionDeContratVueModele
       /// </summary>
        public GestionDeContratVueModele() {


            try
            {

                this.gestiondecontrat = new GestionDeContrat();
                this.contrats = new ObservableCollection<ContratVueModele>();

                this.contrats.Clear();
                foreach (contract contrat in this.gestiondecontrat.ListeDeContrat())
                {
                   // this.contrats.Add(new ContratVueModele());

                         this.contrats.Add(new ContratVueModele() { NOMDUCONTRAT = contrat.title, DATEDEDEBUT = contrat.activeon.Value, DATEDEFIN = contrat.expireson.Value, LESTATUT = contrat.statecode.formattedvalue,LESTATUTAVANT=contrat.access_etatavant.name });


                }

               

                this.pagingView = new PagingCollectionView(this.contrats, 3);
                
                if (this.pagingView == null)
                    throw new NullReferenceException("pagingView");
                this.currentpage = this.pagingView.CurrentPage;
                this.pagingView.CurrentChanged += new EventHandler(pagingView_CurrentChanged);
            }
            catch(System.Web.Services.Protocols.SoapException soapEx){

                soapEx.Detail.OuterXml.ToString();
            
            }
        }

       /// <summary>
       ///
       /// </summary>
       /// <param name="sender"></param>
       /// <param name="e"></param>
        void pagingView_CurrentChanged(object sender, EventArgs e)
        {
            OnPropertyChanged("SelectedContrat");
            Dispose();
            //throw new NotImplementedException();
        }



                /// <summary>
        /// Propriété permettant de manipuler la
        ///Vue Modèle de la liste des contrats
        /// </summary>
        public ObservableCollection<ContratVueModele> Lescontrats
        {

            get
            {

                return this.contrats;
            }


        }



      

    }

      
      
       
        }


       code xaml:

       <UserControl x:Class="GestionDeContrats_Offres_ClientsGUI.VueModele.UserControlGestionContrat"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             x:Name="GestionContrat"
             xmlns:local="clr-namespace:GestionDeContrats_Offres_ClientsGUI.VueModele"
             d:DesignHeight="300"  >
    <UserControl.DataContext>
        <local:GestionDeContratVueModele  />
    </UserControl.DataContext>
   
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="40"/>
            <RowDefinition />
            <RowDefinition Height="40"/>
        </Grid.RowDefinitions>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="320"/>
                <ColumnDefinition Width="40" />
            </Grid.ColumnDefinitions>
            <TextBox Name="searchtexbox" Grid.Column="0"/>
            <Image Grid.Column="1" Source="/GestionDeContrats_Offres_ClientsGUI;component/Images/16_find.gif" />
        </Grid>
        <ToolBar Grid.Row="1" Name="toolbarcontrat">
            <Button    Name="btNewContrat"  Click="btNewContrat_Click">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Image Source="/GestionDeContrats_Offres_ClientsGUI;component/Images/plusvert.jpg" />
                    <Label Content="Nouveau" Grid.Column="1"/>

                </Grid>
            </Button>

            <Button    Name="btCopierContrat" >
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Image Source="/GestionDeContrats_Offres_ClientsGUI;component/Images/editcopy.png" />
                    <Label Content="Copier" Grid.Column="1"/>

                </Grid>
            </Button>
            <Button    Name="btSupprimerContrat" >
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Image Source="/GestionDeContrats_Offres_ClientsGUI;component/Images/delgreen16.jpg" />
                    <Label Content="Supprimer" Grid.Column="1"/>
                </Grid>
            </Button>
            <Button    Name="btModifierContrat" >
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Image Source="/GestionDeContrats_Offres_ClientsGUI;component/Images/ico_18_4207.gif" />
                    <Label Content="Modifier" Grid.Column="1"/>
                </Grid>
            </Button>
           
        </ToolBar>

        <DataGrid Name="listViewContrat" Grid.Row="2" ItemsSource="{Binding Path=Lescontrats, Mode=OneWay}"  IsSynchronizedWithCurrentItem="True" AutoGenerateColumns="False" CanUserReorderColumns="True" CanUserResizeColumns="True" CanUserSortColumns="True" CanUserAddRows="True" CanUserDeleteRows="True">
            <DataGrid.Columns>
                <DataGridTemplateColumn Header="Nom du contrat" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=NOMDUCONTRAT, Mode=OneWay}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="Date de début" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=DATEDEDEBUT, Mode=OneWay}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="Date de fin"  >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=DATEDEFIN, Mode=OneWay}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
               
                <DataGridTemplateColumn Header="Statut" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=LESTATUT,Mode=OneWay}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="Statut avant" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text=""/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
        <StackPanel Grid.Row="3" Orientation="Horizontal">
            <Label Margin="2" Content=""/>
            <Button Content="Suivant" Name="btNext" Margin="2" />
            <Button Content="Précédent" Name="btPrevious" Margin="2"  />
                
            
        </StackPanel>
        
        
        
    </Grid>
</UserControl>


      
 I include link to this usercontrol into MainWindow.xaml.

Thanks 

Regards