datagrid and collections - Error

[Nic]

Hey,

Struggling for a few days now.

I have a piece of code (see below). It is an array bound to an asp-datagrid.
There are 3 objects in the array, so 3 items in the datagrid.
I select the second item (Object2) and delete it out of the array an then
rebind the array to the datagrid.
Then automatically the next item in datagrid is selected (Onject2), I delete
out of the array and rebind the array.
Then nothing is selected in the array, but Object1 is still there. One I
push delete (without selecting the item with a mouse-click) I receive an
error on the test if there is an item selected.

I don't understand what is wrong here. Ok, there is no selecteditem but
therfor I do a test. And that test fails?
Can someone explains me what is wrong in that case.
Thanks a lot.

(this is working code)

using System.Drawing;
using System.Web;
using System.Web.Sess ionState;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Web.UI.H tmlControls;

namespace TestDg
{
public class WebForm1 : System.Web.UI.P age
{
protected System.Web.UI.W ebControls.Data Grid DGusers;
protected System.Web.UI.W ebControls.Butt on Button2;
ArrayList myarr = new ArrayList();

private void Page_Load(objec t sender, System.EventArg s e)
{
if (!Page.IsPostBa ck)
{
myarr.Add(new Obj("Object1"," nhz"));
myarr.Add(new Obj("Object2"," pvp"));
myarr.Add(new Obj("Object3"," jnj"));

Session.Add("Ar r",null);
Session["Arr"] = myarr;

this.DGusers.Da taSource = myarr;
this.DGusers.Da taBind();
}
myarr = (ArrayList) Session["Arr"];
}

#region Web Form Designer generated code
override protected void OnInit(EventArg s e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeCompo nent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.Button2.Cl ick += new System.EventHan dler(this.Butto n2_Click);
this.Load += new System.EventHan dler(this.Page_ Load);

}
#endregion

private void Button2_Click(o bject sender, System.EventArg s e)
{
if (this.DGusers.S electedItem != null)
{
myarr.RemoveAt( this.DGusers.Se lectedIndex);

this.DGusers.Da taSource = myarr;
this.DGusers.Da taBind();

Session["Arr"] = myarr;
}
}

public class Obj
{

public Obj(string nm, string ini)
{
this.mnaam = nm;
this.minit = ini;
}
private string mnaam;

public string Naam
{
get
{
return mnaam;
}
set
{
mnaam = value;
}
}

private string minit;
public string Initialen
{
get
{
return minit;
}
set
{
minit = value;
}

}
}
}
}