How can fix the error "CS1503 C# Argument 2: cannot convert from 'CoffeeShopApp.CoffeeShopDBEntities' to 'System.Data.Entity.Core.Objects.ObjectContext'"

Question

0.00/5 (No votes)

See more:

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Entity.Core.Objects;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CoffeeShopApp
{
    public partial class frmViewProduct : Form
    {
        CoffeeShopDBEntities cse = new CoffeeShopDBEntities();

        public frmViewProduct()
        {
            InitializeComponent();

            dgv.DataSource = cse.tblProducts.ToList();
            dgv.Columns["ProductType"].Visible = false;
            dgv.Columns["tbleProductType"].Visible = false;
            dgv.Columns["tblTransactionItems"].Visible = false;
        }

        private void cboProductType_SelectionChangeCommitted(object sender, EventArgs e)
        {
            ObjectQuery<tblProduct> filteredProducts = new ObjectQuery<tblProduct>(
                "select value product from tblProduct as product where product.ProductType =" + cboProductType.SelectedValue, cse);--->> I got error here with cse

            dgv.DataSource = filteredProducts;
        }
    }
}

Posted 28-Nov-15 9:35am

Member 11232188

Add a Solution

Comments

Member 11232188 28-Nov-15 21:33pm

I need help

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 29-Nov-15 0:22am

So, clearly there is a problem in conversion. First execute the query and populate in a datatable. Use that as the datasource.

Member 11232188 29-Nov-15 0:51am

How???

2 solutions

Solution 2

See the example here - Databinding with DataGridView in ADO.NET[^].

Posted 28-Nov-15 19:46pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Manas_Kumar · Accepted Answer · 2015-11-28T19:44:00

Try with below processes:

Through entity Entity SQL:

C#

//Querying with Object Services and Entity SQL
string sqlString = "SELECT VALUE st FROM CoffeeShopDBEntities.tblProduct AS st WHERE st.ProductType == '" + cboProductType.SelectedValue+ "'";

var objctx = (ctx as IObjectContextAdapter).ObjectContext;
		
ObjectQuery<tblproduct> filteredProducts = objctx.CreateQuery<tblproduct>(sqlString);
</tblproduct></tblproduct>

Through Native SQL:

C#

using (var ctx = new CoffeeShopDBEntities())
{
	var filteredProducts = ctx.tblProduct.SqlQuery("select value product from tblProduct as product where product.ProductType = '" + cboProductType.SelectedValue + "'").ToList<tblproduct>();
}
</tblproduct>

Note: Above code written as assuming the entity name as tblProduct. If it is different like "Products" in EF then change it.