Check only one checkbox in GridViewCheckBoxColumn

Product Version	Product	Author	Last modified
Q3 2009 SP1	RadGridView for WinForms	Nikolay Diyanov	Jan 13, 2009

INTRODUCTION

By default, GridViewCheckBoxColumn allows for multiple checked checkboxes. However, in certain cases you may want to use it as a kind of RadioButton column - i.e. allow the user to check only one checkbox at a time.

SOLUTION

In order to implement the desired requirement, first subscribe to the ValueChanged event and then execute the following code snippet in the ValueChanged event handler:

void radGridView1_ValueChanged(object sender, EventArgs e)
{
    RadCheckBoxEditor editor = sender as RadCheckBoxEditor;
    if (editor != null && (bool)editor.Value == true)
    {
        this.radGridView1.GridElement.BeginUpdate();
        foreach (GridViewDataRowInfo row in this.radGridView1.Rows)
        {
            if (row != this.radGridView1.CurrentRow)
            {
                row.Cells["Bool"].Value = false;
            }
        }
        this.radGridView1.GridElement.EndUpdate();
    }
}

Private Sub radGridView1_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim editor As RadCheckBoxEditor = TryCast(sender, RadCheckBoxEditor)
    If Not editor Is Nothing AndAlso CBool(editor.Value) = True Then
        Me.radGridView1.GridElement.BeginUpdate()
        For Each row As GridViewDataRowInfo In Me.radGridView1.Rows
            If Not row Is Me.radGridView1.CurrentRow Then
                row.Cells("Bool").Value = False
            End If
        Next row
        Me.radGridView1.GridElement.EndUpdate()
    End If
End Sub

Basically, we first check if the current editor is RadCheckBoxEditor and if the editor's value is true. If this case is true, we set the value of all the cells contained in the current column, but not contained in the current row to false.