Object reference not set to an instance of the object

Question

Hi

  I am getting error - Object reference not set to an instance of the object.

objShippingOrdr.consignee.name = txtConsigneeName.Text;

Below is the code

public class ModelClass
{
    public string OrderNo { get; set; }
    public int shipping_charges { get; set; }
    public int discount { get; set; }
    public int cod_charges { get; set; }
    public string PaymentType { get; set; }
    public decimal OrderAmount { get; set; }
    public Consignee consignee { get; set; }

}

public class Consignee
{
    public string name { get; set; }
    public string address { get; set; }
    public string address_2 { get; set; }
    public string city { get; set; }
    public string state { get; set; }
    public Int32 pincode { get; set; }
    public Int32 phone { get; set; }
}

public void CreateShippingOrder()
{
    var objShippingOrdr = new ModelClass();

    objShippingOrdr.OrderNo = txtOrderNo.Text;
    objShippingOrdr.PaymentType = ddlPaymentType.SelectedItem.Value;
    objShippingOrdr.OrderAmount = Convert.ToDecimal(txtOrderAmount.Text);

    objShippingOrdr.consignee.name = txtConsigneeName.Text;
    objShippingOrdr.consignee.address = txtConsigneeAddress.Text;
}

protected void btnSubmit_Click(object sender, EventArgs e)
{
    CreateShippingOrder();
}

Thanks