How to use ImageButton for ImageUpload in to the Image Box and ImageSave in to the Server.MapPath using c# asp.net?

<div class="frant-page-header"><div class="frant-page-header-logo">
<div style="height: 0px; overflow: hidden">
<asp:FileUpload ID="UploadLogo" runat="server" />
</div>
<asp:ImageButton ID="ImageLogo" runat="server" ImageUrl="~/images/64.png" style="width: 100px; height: 100px; line-height: 100px;"
OnClientClick="chooseFile();" />
<script type="text/javascript">
function chooseFile() {
document.getElementById("UploadLogo").click();
}
</script>

protected void ImageLogo_Click(object sender, ImageClickEventArgs e)
{
Boolean FileOK = false;
Boolean FileSaved = false;

if (Upload.HasFile)
{
Session["WorkingImage"] = Upload.FileName;
String FileExtension = Path.GetExtension(Session["WorkingImage"].ToString()).ToLower();
String[] allowedExtensions = { ".png", ".jpeg", ".jpg", ".gif" };
for (int i = 0; i < allowedExtensions.Length; i++)
{
if (FileExtension == allowedExtensions[i])
{
FileOK = true;
}
}
}

if (FileOK)
{
try
{
Upload.PostedFile.SaveAs(path + Session["WorkingImage"]);

FileSaved = true;
}
catch (Exception ex)
{
LabelWelcome.Text = "File could not be uploaded." + ex.Message.ToString();
LabelWelcome.Visible = true;
FileSaved = false;
}
}
else
{
LabelWelcome.Text = "Cannot accept files of this type.";
LabelWelcome.Visible = true;
}

if (FileSaved)
{
//pnlUpload.Visible = false;
//pnlCrop.Visible = true;

ImageLogo.ImageUrl = "Templates/" + Session["WorkingImage"].ToString();
//uploadImage.ImageUrl = "Templates/" + Session["WorkingImage"].ToString();
}

//Session["TempID"] = TextTemplateId.Value.ToString();
}