Cannot implicitly convert typre 'string' to 'short' : protected void btnAdd_Click(object sender, EventArgs e)
    {
     

        if (!string.IsNullOrWhiteSpace(Request.QueryString["id"]))
        {

       
            string kundeID = "-1";
            int id = Convert.ToInt32(Request.QueryString["id"]);
            int totalsum = Convert.ToInt32(ddlAmount.SelectedValue);

            Handlevogn handlevogn = new Handlevogn
            {
                TotalSum = totalsum,
                KundeID = kundeID,
                Dato = DateTime.Now,
                ErIHandlevogn = true,
                ProduktID = id
            };

            HandlevognModell modell = new HandlevognModell();
            lblResult.Text = modell.InsertHandlevogn(handlevogn);

        } 

Keep getting the error

> Cannot implicitly convert typre 'string' to 'short'

for the local variable kundeID. 
