Unable to save the image into the directory in my project solution

This function is called when user click the submit button and it would save the image into my project directory and the filename into SQL database. I currently having problem that when i run the project it would not work. How i can fix my code? Any help will be very appreciated thanks.

private Product CreateProduct()
{
    Product product = new Product();
    string filename = Path.GetFileName(FileUpload1.FileName);
    product.Name = txtName.Text;
    product.Price = Convert.ToInt32(txtPrice.Text);
    product.TypeID = Convert.ToInt32(ddltype.SelectedValue);
    product.Description = txtDescription.Text;
    if (FileUpload1.HasFile)
    {
        FileUpload1.SaveAs(Server.MapPath("~/Images/Products/") + filename);
    }
    product.Image = FileUpload1.FileName;

    return product;
}

UPDATED : The error is System.IO.DirectoryNotFoundException
HResult=0x80070003 Message=Could not find a part of the path 'C:\Users\user\source\repos\FYP\FYP\Images\Products\testing.png'.
Source= StackTrace:

code does not get Products directory, first check Products directory exists or not if no exists then create directory check code below,

private Product CreateProduct()
{
    Product product = new Product();
    string filename = Path.GetFileName(FileUpload1.FileName);
    product.Name = txtName.Text;
    product.Price = Convert.ToInt32(txtPrice.Text);
    product.TypeID = Convert.ToInt32(ddltype.SelectedValue);
    product.Description = txtDescription.Text;
 bool exists = System.IO.Directory.Exists(Server.MapPath("~/Images/Products/"));
            if (!exists)
                System.IO.Directory.CreateDirectory(Server.MapPath("~/Images/Products/"));
    if (FileUpload1.HasFile)
    {
        FileUpload1.SaveAs(Server.MapPath("~/Images/Products/") + filename);
    }
    product.Image = FileUpload1.FileName;

    return product;
}