How to add a ComboBox into DataGridView

In this post, I'm going to explain to add a ComboBox into a DataGridViews' Column.  Here, I create a DataGridViewComboBoxColumn object and add it to the table column. Also I'm using my test Database to fill the ComboBox. You can see the below screenshot of the ComboBox which is inside the DataGridView.

 
 

Create a project in Visual Studio and add DataGridView to the Form.

 

Add the following code to the Form1.cs class.

 

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ComboBoxInDataGridView
{
    public partial class Form1 : Form
    {
        DataGridViewComboBoxColumn column;
        public Form1()
        {
            InitializeComponent();
            dropDownCell();
            fillSalesRepsInsideTable();
        }
        private void dropDownCell() {
            column = new DataGridViewComboBoxColumn();
            dataGridView1.Columns.Add(column);
            column.DisplayMember = "Guide";
            column.ValueMember = "10";
            column.HeaderText = "Sales Rep.";
            //column.ToolTipText = "Please enter the name of the Sales Rep.";
            //column.Name = "nbb";
            column.FlatStyle = FlatStyle.Flat;
            // column.DataPropertyName = "sales rep";
       
        }
        private void fillSalesRepsInsideTable()
        {
            string connectionString = "Server=localhost\\sqlexpress;Database=test;User Id=sa;Password=abc123;";

            SqlConnection connection = new SqlConnection(connectionString);
            String query = @"Select * From student;";

            SqlCommand command = new SqlCommand(query, connection);
            connection.Open();
            SqlDataReader sqlReader = command.ExecuteReader();
            try
            {
                while (sqlReader.Read())
                {
                    column.Items.Add(sqlReader[1]);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("An error occurred: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                sqlReader.Close();
            }
            connection.Close();
        }
    }
}

See the result by running the project.

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