I have a really annoying problem with a datagrid. I have an application which
populates a datagrid on the onclick event of a button. The datagrid is bound
to an ArrayList which holds the values.  Everything worked perfectly for me
in my test application however when I copied and pasted the code accross to
my main project something strange started to happen.  On the on-click event
of the button (cmdExcAdrContinue) the datagrid is populated and shown in the
panel however an extra blank row is created in the datagrid containing extra
values.  I stepped through the code and it seems to go through the
cmdExcAdrContinue_Click event twice. It doesn't do this in my test
application so I can't seem to figure it out. its probably something simple.
Has anyone got any ideas????

protected void cmdExcAdrContinue_Click(object sender, System.EventArgs e)
{
    ArrayList addresses;   
    addresses = (ArrayList) ViewState["Addresses"];

    Address newAddress = new Address();
    newAddress.Address1 = this.txtAddress1.Text.Trim();
    newAddress.Address2 = this.txtAddress2.Text.Trim();
    newAddress.Address3 = this.txtAddress3.Text.Trim();
    newAddress.Address4 = this.txtAddress4.Text.Trim();
    newAddress.Address5 = this.txtAddress5.Text.Trim();
    newAddress.Address6 = this.txtAddress6.Text.Trim();
           
    addresses.Add(newAddress);
    ViewState["Addresses"] = addresses;
           
    this.dgSearchAddresses.DataSource = addresses;
    this.dgSearchAddresses.DataBind();

    //clear down the textboxes
    this.txtAddress1.Text = "";
    this.txtAddress2.Text = "";
    this.txtAddress3.Text = "";
    this.txtAddress4.Text = "";
    this.txtAddress5.Text = "";
    this.txtAddress6.Text = "";

    this.pnlExceptionAddress.Visible = false;

    LiteralControl li = new LiteralControl("<script
language=JavaScript>document.getElementById('txtHouseNum').focus();</script>");
    Page.Controls.Add(li);

    checkArrayList();
}

private void Page_Load(object sender, System.EventArgs e)
{
checkArrayList();
ArrayList addresses;

// when the page is first loaded only
    if( !IsPostBack )
    {
        addresses = new ArrayList();
        ViewState["Addresses"] = addresses;
    }
// on subsequent PostBacks:
    else
    {
    addresses = (ArrayList) ViewState["Addresses"];
    if( addresses != null )
    {   
    this.dgSearchAddresses.DataSource =
addresses;        this.dgSearchAddresses.DataBind();
LiteralControl li = new LiteralControl("<script
language=JavaScript>document.getElementById('txtHouseNum').focus();</script>");
Page.Controls.Add(li);
    }   
    }
//Hide this two panels to begin with
    this.pnlAddressResults.Visible =false;
    this.pnlExceptionAddress.Visible =false;
}

private void checkArrayList()
{
    if(dgSearchAddresses.Items.Count == 0)
    {
        this.pnlSearchAddresses.Visible = false;
    }
        else
    {
        this.pnlSearchAddresses.Visible = true;
    }
}