CatProejct/CatProject/Windows/WindowNameSurname.xaml

<Window x:Class="CatProject.WindowNameSurname"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:CatProject"
        mc:Ignorable="d"
        Title="WindowNameSurname" Height="450" Width="800">
    <Grid>
        <StackPanel>
            <GroupBox Header="Изменить имя">
                <TextBox Name ="TBName"></TextBox>
            </GroupBox>
            <GroupBox Header="Изменить фамилию">
                <TextBox Name="TBSurname"></TextBox>
            </GroupBox>
            <Button HorizontalAlignment="Center" Click="Button_Click">Изменить личную информацию</Button>
        </StackPanel>
    </Grid>
</Window>