Как отредактировать выбранную строку в Datagrid в WPF

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у меня есть кнопка редактирование столбца соответствующая каждой строке в datagrid при нажатии этой кнопки я хочу получить соответствующее значение редактирования строки как мы можем это сделать

код xaml-это :-

<Window x:Class="Wpf_grid.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="326" Width="946">
<Grid>
    <DataGrid Name="MyDataGrid" Uid="MyDataGrid" AutoGenerateColumns="False" AlternationCount="2" SelectionMode="Single" Margin="0,31,0,0" >
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Path=RegId}" IsReadOnly="True" Header="Registration Id" Width="sizeToHeader"/>
            <DataGridTextColumn Binding="{Binding Path=Name}" Header="Name" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=FName}" Header="Father Name" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=ContactNumber}" Header="Contact Number" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=email}" Header="email" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=password}" Header="password" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=paddress}" Header="paddress" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=pcity}" Header="pcity" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=pstate}" Header="pstate" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=ppinCode}" Header="ppinCode" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=caddress}" Header="caddress" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=ccity}" Header="ccity" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=cstate}" Header="cstate" Width="sizeToHeader" />
            <DataGridTextColumn Binding="{Binding Path=cpinCode}" Header="cpinCode" Width="sizeToHeader" />
            <DataGridTemplateColumn Header="Edit Row">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <Button Content="Edit" Click="btnEdit_Click"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTemplateColumn Header="Delete Row">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <Button Content="Delete" Click="btnDelete_Click"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>

    <Button Content="LoadCustomer" Name="LoadCustomer" Height="23" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="0,5,0,0" Click="LoadCustomer_Click" />

</Grid>

а код .cs-это:-

private void btnEdit_Click(object sender, RoutedEventArgs e)
   {
       try
       {
           gridDataContext datacontext = new gridDataContext();
           registration registrationRow = MyDataGrid.SelectedValue as registration;
           int m = registrationRow.RegId;
           //registration Registration = (from p in datacontext.registrations where p.RegId == registrationRow.RegId select p).Single();
           registration Registration = datacontext.registrations.Where(A => A.RegId == m).Single();
           Registration.Name = registrationRow.Name;
           Registration.FName = registrationRow.FName;
           datacontext.SubmitChanges();
           MessageBox.Show("Row Updated Successfully");
           LoadCustomerDetail();
       }
       catch (Exception ex)
       {
           MessageBox.Show(ex.Message);
           return;
       }
   }

кто-нибудь подскажет мне, как я могу редактировать при нажатии кнопки ??

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