Combo Box inside the DataGridView of WinForm application

Using ComboBox in DataGridView :

Implementation :

DataGridView is binding with the datatable, when use click over any row, than this row cell element convert into

combobox and now user able to select combo box elements .

Issue :

It is working fine for all the cases,

" dgvTables(e.ColumnIndex, e.RowIndex) = l_cmbTableList "

but issue is coming when e.ColumnIndex and e.RowIndex having same value, at that time combobox list item looks jumpy, user not able to select this combobox items

at first time . .

Code :

Private Sub dgvTables_CellClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvTables.CellClick

If e.ColumnIndex > -1 Then

If dgvTables.Columns(e.ColumnIndex).Name.Contains("TableCaption") Then

dgvTables(e.ColumnIndex, e.RowIndex) = l_cmbTableList ' Problem is coming at that point, dropdown list is jumpy, user not able to select item .

l_cmbTableList.DisplayMember = CONST_TableCaption

l_cmbTableList.ValueMember = CONST_TableCaption

l_cmbTableList.DataSource = dt

l_cmbTableList.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing

End If

Private Sub dgvTables_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgvTables.EditingControlShowing

'Set the value of the object

cmbEditingComobTables = CType(e.Control, ComboBox)

If Not cmbEditingComobTables Is Nothing Then

AddHandler cmbEditingComobTables.SelectedIndexChanged, AddressOf editingCombo_SelectedIndexChanged

cmbEditingComobTables.DrawMode = DrawMode.OwnerDrawFixed

AddHandler cmbEditingComobTables.DrawItem, AddressOf cmb_DrawItem ' This attached event will fire and set the color of combo box item

End If

Private Sub cmb_DrawItem(ByVal sender As System.Object, ByVal e As DrawItemEventArgs)

If Not e.Index = -1 Then

Dim cmb As ComboBox = DirectCast(sender, ComboBox)

Dim dr As DataRowView = DirectCast(cmb.Items(e.Index), DataRowView)

e.DrawBackground()

e.Graphics.DrawString(dr(cmb.DisplayMember).ToString(), e.Font, New SolidBrush(Color.Gray), e.Bounds.X, e.Bounds.Y)

End If

using System;

using System.Data;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace WindowsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

dataGridView1.ColumnCount = 3;

dataGridView1.Columns[0].Name = "Product ID";

dataGridView1.Columns[1].Name = "Product Name";

dataGridView1.Columns[2].Name = "Product Price";

string[] row = new string[] { "1", "Product 1", "1000" };

dataGridView1.Rows.Add(row);

row = new string[] { "2", "Product 2", "2000" };

dataGridView1.Rows.Add(row);

row = new string[] { "3", "Product 3", "3000" };

dataGridView1.Rows.Add(row);

row = new string[] { "4", "Product 4", "4000" };

dataGridView1.Rows.Add(row);

DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();

cmb.HeaderText = "Select Data";

cmb.Name = "cmb";

cmb.MaxDropDownItems = 4;

cmb.Items.Add("True");

cmb.Items.Add("False");

dataGridView1.Columns.Add(cmb);

}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Dipankar Biswas12y ago
using System;
using System.Data;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
dataGridView1.ColumnCount = 3;
dataGridView1.Columns[0].Name = "Product ID";
dataGridView1.Columns[1].Name = "Product Name";
dataGridView1.Columns[2].Name = "Product Price";

string[] row = new string[] { "1", "Product 1", "1000" };
dataGridView1.Rows.Add(row);
row = new string[] { "2", "Product 2", "2000" };
dataGridView1.Rows.Add(row);
row = new string[] { "3", "Product 3", "3000" };
dataGridView1.Rows.Add(row);
row = new string[] { "4", "Product 4", "4000" };
dataGridView1.Rows.Add(row);

DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
cmb.HeaderText = "Select Data";
cmb.Name = "cmb";
cmb.MaxDropDownItems = 4;
cmb.Items.Add("True");
cmb.Items.Add("False");
dataGridView1.Columns.Add(cmb);

}
}
}
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