[Solved] Setting Class property Error: Object reference not set to an instance of the Object

Hi ramco1917,

You need to create instance of Consignee class and set the properties.

Then set the Consignee class object to the ModelClass property.

Refer updated 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);
    Consignee consignee = new Consignee();
    consignee.name= txtConsigneeName.Text;
    consignee.address = txtConsigneeAddress.Text;
    objShippingOrdr.consignee = consignee;
}

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