Check uncheck CheckBoxColumn in Windows Form DataGridView based on another using C# and VB.Net

Hi satabeach,

Check the below example.

Code

C#

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

    private void Form1_Load(object sender, EventArgs e)
    {
        this.BindDataGridView();
    }

    private void BindDataGridView()
    {
        dgvDetails.AllowUserToAddRows = false;

        DataTable dt = new DataTable();
        dt.Columns.Add(new DataColumn("Course"));
        dt.Rows.Add("Diploma in Information Technology");
        dt.Rows.Add("Diploma in Bussiness Administration");
        dgvDetails.DataSource = dt;

        DataGridViewCheckBoxColumn checkBoxColumn = new DataGridViewCheckBoxColumn();
        checkBoxColumn.HeaderText = "First Choice";
        checkBoxColumn.Width = 80;
        checkBoxColumn.Name = "cbCheck1";
        dgvDetails.Columns.Insert(1, checkBoxColumn);

        DataGridViewCheckBoxColumn checkBoxColumn2 = new DataGridViewCheckBoxColumn();
        checkBoxColumn2.HeaderText = "Second Choice";
        checkBoxColumn2.Width = 100;
        checkBoxColumn2.Name = "cbCheck2";
        dgvDetails.Columns.Insert(2, checkBoxColumn2);

        dgvDetails.CellContentClick += new DataGridViewCellEventHandler(dgvDetails_CellClick);
    }

    private void dgvDetails_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        DataGridViewRow row1 = dgvDetails.Rows[0];
        DataGridViewRow row2 = dgvDetails.Rows[1];
        if (e.RowIndex == 0 && e.ColumnIndex == 1)
        {
            row1.Cells["cbCheck2"].Value = !Convert.ToBoolean(row1.Cells["cbCheck1"].EditedFormattedValue);
            row2.Cells["cbCheck1"].Value = !Convert.ToBoolean(row1.Cells["cbCheck1"].EditedFormattedValue);
            row2.Cells["cbCheck2"].Value = Convert.ToBoolean(row1.Cells["cbCheck1"].EditedFormattedValue);
        }

        if (e.RowIndex == 0 && e.ColumnIndex == 2)
        {
            row1.Cells["cbCheck1"].Value = !Convert.ToBoolean(row1.Cells["cbCheck2"].EditedFormattedValue);
            row2.Cells["cbCheck1"].Value = Convert.ToBoolean(row1.Cells["cbCheck2"].EditedFormattedValue);
            row2.Cells["cbCheck2"].Value = !Convert.ToBoolean(row1.Cells["cbCheck2"].EditedFormattedValue);
        }

        if (e.RowIndex == 1 && e.ColumnIndex == 1)
        {
            row2.Cells["cbCheck2"].Value = !Convert.ToBoolean(row2.Cells["cbCheck1"].EditedFormattedValue);
            row1.Cells["cbCheck1"].Value = !Convert.ToBoolean(row2.Cells["cbCheck1"].EditedFormattedValue);
            row1.Cells["cbCheck2"].Value = Convert.ToBoolean(row2.Cells["cbCheck1"].EditedFormattedValue);
        }

        if (e.RowIndex == 1 && e.ColumnIndex == 2)
        {
            row2.Cells["cbCheck1"].Value = !Convert.ToBoolean(row2.Cells["cbCheck2"].EditedFormattedValue);
            row1.Cells["cbCheck1"].Value = Convert.ToBoolean(row2.Cells["cbCheck2"].EditedFormattedValue);
            row1.Cells["cbCheck2"].Value = !Convert.ToBoolean(row2.Cells["cbCheck2"].EditedFormattedValue);
        }
    }
}

VB.Net

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Me.BindDataGridView()
    End Sub

    Private Sub BindDataGridView()
        dgvDetails.AllowUserToAddRows = False
        Dim dt As DataTable = New DataTable()
        dt.Columns.Add(New DataColumn("Course"))
        dt.Rows.Add("Diploma in Information Technology")
        dt.Rows.Add("Diploma in Bussiness Administration")
        dgvDetails.DataSource = dt
        Dim checkBoxColumn As DataGridViewCheckBoxColumn = New DataGridViewCheckBoxColumn()
        checkBoxColumn.HeaderText = "First Choice"
        checkBoxColumn.Width = 80
        checkBoxColumn.Name = "cbCheck1"
        dgvDetails.Columns.Insert(1, checkBoxColumn)
        Dim checkBoxColumn2 As DataGridViewCheckBoxColumn = New DataGridViewCheckBoxColumn()
        checkBoxColumn2.HeaderText = "Second Choice"
        checkBoxColumn2.Width = 100
        checkBoxColumn2.Name = "cbCheck2"
        dgvDetails.Columns.Insert(2, checkBoxColumn2)
        AddHandler dgvDetails.CellContentClick, AddressOf dgvDetails_CellClick
    End Sub

    Private Sub dgvDetails_CellClick(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs)
        Dim row1 As DataGridViewRow = dgvDetails.Rows(0)
        Dim row2 As DataGridViewRow = dgvDetails.Rows(1)

        If e.RowIndex = 0 AndAlso e.ColumnIndex = 1 Then
            row1.Cells("cbCheck2").Value = Not Convert.ToBoolean(row1.Cells("cbCheck1").EditedFormattedValue)
            row2.Cells("cbCheck1").Value = Not Convert.ToBoolean(row1.Cells("cbCheck1").EditedFormattedValue)
            row2.Cells("cbCheck2").Value = Convert.ToBoolean(row1.Cells("cbCheck1").EditedFormattedValue)
        End If

        If e.RowIndex = 0 AndAlso e.ColumnIndex = 2 Then
            row1.Cells("cbCheck1").Value = Not Convert.ToBoolean(row1.Cells("cbCheck2").EditedFormattedValue)
            row2.Cells("cbCheck1").Value = Convert.ToBoolean(row1.Cells("cbCheck2").EditedFormattedValue)
            row2.Cells("cbCheck2").Value = Not Convert.ToBoolean(row1.Cells("cbCheck2").EditedFormattedValue)
        End If

        If e.RowIndex = 1 AndAlso e.ColumnIndex = 1 Then
            row2.Cells("cbCheck2").Value = Not Convert.ToBoolean(row2.Cells("cbCheck1").EditedFormattedValue)
            row1.Cells("cbCheck1").Value = Not Convert.ToBoolean(row2.Cells("cbCheck1").EditedFormattedValue)
            row1.Cells("cbCheck2").Value = Convert.ToBoolean(row2.Cells("cbCheck1").EditedFormattedValue)
        End If

        If e.RowIndex = 1 AndAlso e.ColumnIndex = 2 Then
            row2.Cells("cbCheck1").Value = Not Convert.ToBoolean(row2.Cells("cbCheck2").EditedFormattedValue)
            row1.Cells("cbCheck1").Value = Convert.ToBoolean(row2.Cells("cbCheck2").EditedFormattedValue)
            row1.Cells("cbCheck2").Value = Not Convert.ToBoolean(row2.Cells("cbCheck2").EditedFormattedValue)
        End If
    End Sub
End Class

Screenshot