I have solved this myself, thank you guys for your support.
Here is my Code :
WebForm1.aspx.cs
protected void Button1_Click(object sender, EventArgs e)
{
string fileName = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
FileUpload1.PostedFile.SaveAs(Server.MapPath("~/images/" + fileName));
Session["image"] = fileName;
Response.Redirect("WebForm2.aspx");
}
WebForm2.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
if (Session["image"] != null)
{
string fileName = Session["image"].ToString();
img1.ImageUrl = "~/images/" + fileName;
}
}