ASPxGridView – Disable CheckBox based on condition in GridViewCommandColumn

You can use code below:

protected void ASPxGridView1_CommandButtonInitialize(object sender, ASPxGridViewCommandButtonEventArgs e)
    {
        ASPxGridView grid = (sender as ASPxGridView);
        if (e.ButtonType == ColumnCommandButtonType.SelectCheckbox)
        {
            if(grid.GetRowValues(e.VisibleIndex, "ID").ToString() == "1")
            {
                e.Enabled = false;
            }
            else
            {
                e.Enabled = true;
            }
        }
    }