How to Bind Data to ComboBox from Database in Windows Forms application C#.net || How to Set Default Select Item in ComboBox 0th index.
To bind data to ComboBox in Windows forms follow the steps below:
First Design form with One ComboBox from toolbox in visualstudio.
Then write one ComboBoxBind() method in code behind side and call that method in form load.
Form.cs Code :
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace combox_binding
{
public partial class Form1 : Form
{
SqlConnection con = new SqlConnection("Data Source=naresh;Initial Catalog=employee;User ID=sa;Password=123");
public Form1()
{
InitializeComponent();
ComboBoxBind ();
}
private void ComboBoxBind ()
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter("Select empID,empname from emp", con);
DataTable dt = new DataTable();
da.Fill(dt);
DataRow dr;
dr = dt.NewRow();
dr.ItemArray = new object[] { 0, "---Select an item---" };
dt.Rows.InsertAt(dr, 0);
comboBox1.DisplayMember = "empname";
comboBox1.ValueMember = "empID";
comboBox1.DataSource = dt;
con.Close();
}
}
}
Then run the application and see the data will be bind to ComboBox.
OutPut :
