How to upload a image using file upload control?

To upload a image using file upload control
code in .aspx page:

<h1 align="center" style="color: #FF00FF">File Upload Demo</h1>
    <table align="center"><tr><td>
        <asp:Label ID="Label1" runat="server" Text="Name"></asp:Label></td>
       <td><asp:TextBox  ID="TXT_NAME" runat="server"></asp:TextBox></td></tr>
       <tr><td>Image:</td><td><asp:FileUpload ID="fileupload1" runat="server" /></td></tr>
       <tr><td>
           <asp:Image ID="Image1" runat="server" Height="182px" Width="172px" /></td></tr>
       <tr><td colspan="2" align="center">
           <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /></td></tr>
        </table>
        <asp:Label ID="lbl5" runat="server" ></asp:Label>

code in .aspx.cs page:
write below code in click event

 protected void Button1_Click(object sender, EventArgs e)
    {
        
        if (fileupload1.HasFile)
        {
            if (fileupload1.PostedFile.ContentType == "image/jpeg" || fileupload1.PostedFile.ContentType == "image/gif" || fileupload1.PostedFile.ContentType == "image/x-png" && fileupload1.PostedFile.ContentLength == 1024)
            {
                string path = "~/Images/" + fileupload1.FileName;
                fileupload1.SaveAs(Server.MapPath(path));


                Image1.ImageUrl = "~/Images/" + fileupload1.FileName;
                Image1.Visible = true;
                lbl5.Text = "<Script type='text/javascript'>alert('upload success');</script>";
            }
        }


    }

i hope you understood this