Gridview throws index out of rang error on RowUpdating

Hi I have the following ASP.NET page

<form id="form1" runat="server">
    <div>
        <asp:SqlDataSource  ID="SqlDataSource1" SelectCommandType="StoredProcedure"
         SelectCommand="Get_TopSearchTermsByLang" UpdateCommandType="StoredProcedure" UpdateCommand="Update_TopTermPublishStatus" runat="server" />
       
     
       
       
        <asp:DropDownList ID="DropDownList1" AutoPostBack="true" EnableViewState="true"
         OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" runat="server">
        </asp:DropDownList>
       
        <asp:GridView  ID="GridView1"   OnRowUpdating="GridView1_RowUpdating" runat="server" AutoGenerateColumns="False" >
            <Columns>
           
                <asp:BoundField DataField="ID" Visible="False" />
                <asp:BoundField DataField="SearchTerm" HeaderText="Search Term" />
                <asp:BoundField DataField="TotalCount" HeaderText="Item Count" />
       
                <asp:TemplateField>
               
                <ItemTemplate>
                    <asp:CheckBox runat="server" Id="CheckBox1" Checked='<%#Bind("PublishStatus") %>' />
                   
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:ButtonField ButtonType="Button" CommandName="Update" Text="Update" />
            </Columns>
        </asp:GridView>
       

    </div>
    </form>

As you can there is a dropdownlist and a gridview, where the contents of the gridview are filtered on the selection of the dropdownlist.  You are then able to modify the publishstatus checkbox and then click Update and the GridView should refresh databind with the changes but this breaks on the Update method.  I get the following error:

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Source Error:


Line 68:
Line 69:
Line 70:             GridViewRow selectedrow = (GridViewRow)GridView1.Rows[index];
Line 71:             Label1.Text = GridView1.Rows.Count.ToString();
Line 72:
 

Source File: c:\Program Files\Immediacy\CMS\6.0\Admin\Addins\MoogDev\TagCloudAdmin.aspx.cs    Line: 70

Stack Trace:


[ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index]
   System.Collections.ArrayList.get_Item(Int32 index) +2880797
   System.Web.UI.WebControls.GridViewRowCollection.get_Item(Int32 index) +10
   Addins_MoogDev_TagCloudAdmin.GridView1_RowUpdating(Object sender, GridViewUpdateEventArgs e) in c:\Program Files\Immediacy\CMS\6.0\Admin\Addins\MoogDev\TagCloudAdmin.aspx.cs:70
   System.Web.UI.WebControls.GridViewUpdateEventHandler.Invoke(Object sender, GridViewUpdateEventArgs e) +0
   System.Web.UI.WebControls.GridView.OnRowUpdating(GridViewUpdateEventArgs e) +133
   System.Web.UI.WebControls.GridView.HandleUpdate(GridViewRow row, Int32 rowIndex, Boolean causesValidation) +776
   System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +837
   System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument) +199
   System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +177
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746

 
Please help I'm confused why this is happening.  why is it Updating twice?

private SqlDataSource langDS;
 
 
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            langDS = new SqlDataSource();
            langDS.ConnectionString = new iSession().ConnectionString;
            langDS.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;
            langDS.SelectCommand = "immsp_cms_MultiLanguage_GetLanguages";
 
            DropDownList1.DataSource = langDS;
            DropDownList1.DataTextField = "Name";
            DropDownList1.DataValueField = "StringValue";
            
            DropDownList1.DataBind();
            //string[] langvalarray;
            foreach (ListItem item in DropDownList1.Items)
	        {
                item.Value = item.Value.Split('!')[0];
	        }
            SqlDataSource1 = new SqlDataSource();
            SqlDataSource1.ConnectionString = new iSession().ConnectionString;
            SqlDataSource1.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;
            SqlDataSource1.SelectCommand = "Get_TopSearchTermsByLang";
            SqlDataSource1.SelectParameters.Clear();
            SqlDataSource1.SelectParameters.Add("lang", "en");
 
            GridView1.DataSource = SqlDataSource1;
            GridView1.DataBind();
 
        }
        DropDownList1.SelectedIndexChanged += new EventHandler(DropDownList1_SelectedIndexChanged);
        GridView1.RowCommand += new GridViewCommandEventHandler(GridView1_RowCommand);
        GridView1.RowUpdating += new GridViewUpdateEventHandler(GridView1_RowUpdating);
    }
 
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
int index = e.RowIndex;
 
                        GridViewRow selectedrow = (GridViewRow)GridView1.Rows[index];
    
 
 
            SqlDataSource1 = new SqlDataSource();
            SqlDataSource1.ConnectionString = new iSession().ConnectionString;
       
            SqlDataSource1.UpdateParameters.Clear();
            SqlDataSource1.UpdateParameters.Add("termid", (string)selectedrow.Cells[0].ToString());
            SqlDataSource1.UpdateParameters.Add("pubbool", (string)selectedrow.Cells[3].ToString());
 
          
 
            GridView1.DataSource = SqlDataSource1;
            GridView1.DataBind();
        
         
    }
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        //SqlDataSource1 = new SqlDataSource();
        SqlDataSource1.ConnectionString = new iSession().ConnectionString;
 
        SqlDataSource1.SelectParameters.Clear();
        SqlDataSource1.SelectParameters.Add("lang", DropDownList1.SelectedValue);
 
        GridView1.DataSource = SqlDataSource1;
        GridView1.DataBind();
 
        
        
 
        
    }

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