SelectedRows are not cleared when using Begin and EndUpdate

[Arunkumar Dharuman]

I'm facing a problem while updating the DataTable. The SelectedRows list references the old objects when updating the DataTable using BeginUpdate and EndUpdate.

code snippet is as follows:

gridView.GridElement.BeginUpdate();
DataTable dt = gridView.DataSource as DataTable;
dt.Clear();

// Loops a list and add DataRows with dt.NewRow() function

gridView.GridElement.EndUpdate();

Upon execution of the above code, the SelectedRows should ideally be cleared. However, they are still having objects in the List. 
I'm not facing this issue when BeginUpdate() and EndUpdate() function is not used. 

I'm using Q1 2010 SP2.

I understand that this is a old version and it might have got resolved in latest versions, however, I'm not in a state to upgrade. Please suggest me some workaround for this.

[Emanuel Varga]

Hello,

Sorry, i cannot reproduce this issue in the latest version, could you please check if this is happening with the following example:

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Telerik.WinControls.UI;
using Telerik.WinControls.Data;

public partial class Form1 : Form
{
    private RadGridView radGridView1;
    private List<Person> persons;
    public Form1()
    {
        InitializeComponent();
        this.Controls.Add(radGridView1 = new RadGridView());
        radGridView1.Dock = DockStyle.Fill;
        radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
         radGridView1.ReadOnly = true;
        radGridView1.MultiSelect = true;
        radGridView1.EnableFiltering = true;

        persons = new List<Person>();

        for (int i = 0; i < 20; i++)
        {
            if (i % 4 == 0)
            {
                persons.Add(new Person
                {
                    Id = i,
                    Name = "L'Person " + i,
                });
            }
            else
            {
                persons.Add(new Person
                {
                    Id = i,
                    Name = "Person " + i,
                });
            }
        }

        radGridView1.DataSource = persons;

        var button = new RadButton();
        this.Controls.Add(button);
        button.Dock = DockStyle.Bottom;
        button.Text = "Show selected";
        button.Click += new EventHandler(button_Click);
    }

    void button_Click(object sender, EventArgs e)
    {
        radGridView1.GridElement.BeginUpdate();
        persons = new List<Person>();

        for (int i = 0; i < 30; i++)
        {
            if (i % 4 == 0)
            {
                persons.Add(new Person
                {
                    Id = i,
                    Name = "L'Person " + i,
                });
            }
            else
            {
                persons.Add(new Person
                {
                    Id = i,
                    Name = "Person " + i,
                });
            }
        }

        radGridView1.DataSource = persons;
        radGridView1.GridElement.EndUpdate();
        MessageBox.Show(radGridView1.SelectedRows.Count.ToString());
    }
}

public class Person
{
    public int Id
    {
        get;
        set;
    }

    public string Name
    {
        get;
        set;
    }

    public bool Selected
    {
        get;
        set;
    }
}

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga
Telerik WinForms MVP

[Alexander]

Hello Arunkumar,

I confirm this issue exists in the version of RadGridView you use. We have addressed it in the later releases. As a work-around in your version, you can clear the SelectedRows of the control when the rows of the DataSource are cleared:

this.radGridView1.SelectedRows.Clear();

I hope it helps.

Regards,
Alexander
the Telerik team

[Arunkumar Dharuman]

This worked out. Thanks a lot for your support.

I suppose, 

this.radGridView1.ClearSelection();

also do the same. I've used this code in my program.

Once again thanks for your help.

Regards,
ArunDhaJ