I am getting error when trying to import ProductTypeModel.cs file into ManagePro

Question

I am getting error when trying to import ProductTypeModel.cs file into ManageProductType.aspx.cs file.

---------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ProductTypeModel;

public partial class Pages_Management_ManageProductTypes : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        //ProductTypeModel.ProductType pt = new ProductTypeModel.ProductType();
        ProductTypeModel model = new ProductTypeModel();
        ProductType pt = CreateProductType();

        lblResult.Text = model.InsertProductType(pt);
    }

    private ProductType createProductType()
    {
        ProductType p = new ProductType();
        p.Name = txtName.Text;

        return p;
    }
}

ProductTypeModel.cs

---------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for ProductTypeTypeModel
/// </summary>
namespace ProductTypeModel
{
    public class ProductTypeModel
    {
        public string InsertProductType(ProductType productType)
        {
            try
            {
                GarageDBEntities db = new GarageDBEntities();
                db.ProductTypes.Add(productType);
                db.SaveChanges();

                return productType.Name + "was successfully inserted";
            }
            catch (Exception e)
            {
                return "Error:" + e;
            }
        }

        public string UpdateProductType(int id, ProductType productType)
        {
            try
            {
                GarageDBEntities db = new GarageDBEntities();
                // Fetch object from db
                ProductType p = db.ProductTypes.Find(id);

                p.Name = productType.Name;

                db.SaveChanges();
                return productType.Name + "was successfully updated";
            }
            catch (Exception e)
            {
                return "Error:" + e;
            }

        }

        public string DeleteProductType(int id)
        {
            try
            {
                GarageDBEntities db = new GarageDBEntities();
                ProductType productType = db.ProductTypes.Find(id);

                db.ProductTypes.Attach(productType);
                db.ProductTypes.Remove(productType);
                db.SaveChanges();

                return productType.Name + "was successfully deleted";
            }
            catch (Exception e)
            {
                return "Error:" + e;
            }
        }
    }
}

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Explanation / Answer

You need to declare namespace in the file which class will be refernced in other files

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for ProductTypeTypeModel
/// </summary>

namespace productTypeModelName

{
public class ProductTypeModel
{
    public string InsertProductType(ProductType productType)
    {
        try
        {
            GarageDBEntities db = new GarageDBEntities();
            db.ProductTypes.Add(productType);
            db.SaveChanges();

            return productType.Name + "was successfully inserted";
        }
        catch (Exception e)
        {
            return "Error:" + e;
        }
    }

    public string UpdateProductType(int id, ProductType productType)
    {
        try
        {
            GarageDBEntities db = new GarageDBEntities();
            // Fetch object from db
            ProductType p = db.ProductTypes.Find(id);

            p.Name = productType.Name;

            db.SaveChanges();
            return productType.Name + "was successfully updated";
        }
        catch (Exception e)
        {
            return "Error:" + e;
        }

    }

    public string DeleteProductType(int id)
    {
        try
        {
            GarageDBEntities db = new GarageDBEntities();
            ProductType productType = db.ProductTypes.Find(id);

            db.ProductTypes.Attach(productType);
            db.ProductTypes.Remove(productType);
            db.SaveChanges();

            return productType.Name + "was successfully deleted";
        }
        catch (Exception e)
        {
            return "Error:" + e;
        }
    }
}

}

Then you need to add this namespace in which you're referencing those classes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using productTypeModelName;

public partial class Pages_Management_ManageProductTypes : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        //ProductTypeModel.ProductType pt = new ProductTypeModel.ProductType();
        ProductTypeModel model = new ProductTypeModel();
        ProductType pt = CreateProductType();

        lblResult.Text = model.InsertProductType(pt);
    }

    private ProductType createProductType()
    {
        ProductType p = new ProductType();
        p.Name = txtName.Text;

        return p;
    }
}

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