<Window x:Class="WpfAppShowSvg.MainWindow"
          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:svgc="http://sharpvectors.codeplex.com/svgc/"
          mc:Ignorable="d"
          Title="MainWindow" Height="450" Width="800">
     <Grid>
         
          <svgc:SvgViewbox x:Name="my1" Width="180" Height="120"/>
         
     </Grid>
</Window>

using System;
using System.IO;
using System.Windows;

namespace WpfAppShowSvg
{
     public partial class MainWindow : Window
     {
          public MainWindow()
          {
               InitializeComponent();

               try
               {
                    string filePath = @"D:\car.svg";

                    using (StreamReader stream = new StreamReader(filePath))
                    {
                         my1.StreamSource = stream.BaseStream;
                    }
               }
               catch (Exception e)
               {

               }
          }
     }
}