Windows Forms: How to populate ComboBox with data from Database in C#
By FoxLearn 7/25/2017 8:46:57 PM 6.9K
How to populate ComboBox with data from Database in C#.
Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "LinkCombobox" and then click OK
Step 2: Design your form as below
Step 3: Create an EF Model, then add a category table form northwind database to your Entity Framework Model
Step 4: Add code to handle your form as below
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace LinkCombobox { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { try { //Load category data using (NorthwindEntities db = new NorthwindEntities()) { cboCategory.DataSource = db.Categories.ToList(); cboCategory.ValueMember = "CategoryID"; cboCategory.DisplayMember = "CategoryName"; } } catch (Exception ex) { MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void cboCategory_SelectionChangeCommitted(object sender, EventArgs e) { Cursor.Current = Cursors.WaitCursor; //Update data to textbox Category obj = cboCategory.SelectedItem as Category; if (obj != null) { txtCategoryID.Text = obj.CategoryID.ToString(); txtCategoryName.Text = obj.CategoryName; txtDescription.Text = obj.Description; } Cursor.Current = Cursors.Default; } } }
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