Specified argument was out of the range of valid values Parameter name: index

Specified argument was out of the range of valid values.
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: Specified argument was out of the range of valid values.
Parameter name: index
 
Source Error: 
 
 
Line 49:         Dim cmd As New SqlCommand()
Line 50:         cmd.CommandText = "UPDATE objectdiary set shortdescription = @description where objectdiaryid = @objectid"
Line 51:         cmd.Parameters.Add("@description", SqlDbType.VarChar).Value = DirectCast(GridView1.Rows(e.RowIndex).Cells(2).Controls(0), TextBox).Text
Line 52:         cmd.Parameters.Add("@objectid", SqlDbType.Int).Value = Convert.ToInt32(GridView1.Rows(e.RowIndex).Cells(0).Text)
Line 53:         cmd.Connection = con
 
 
Source File: \\rdb1\hr\QuestionCategories.aspx.vb    Line: 51 
 
Stack Trace: 
 
 
[ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index]
   System.Web.UI.ControlCollection.get_Item(Int32 index) +2107838
   QuestionCategories.GridView1_RowUpdating(Object sender, GridViewUpdateEventArgs e) in \\rdb1\hr\QuestionCategories.aspx.vb:51
   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.OnBubbleEvent(Object source, EventArgs e) +95
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
   System.Web.UI.WebControls.GridViewRow.OnBubbleEvent(Object source, EventArgs e) +117
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
   System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +115
   System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +132
   System.Web.UI.WebControls.LinkButton.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
 
 
And this is my gridview
 
 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
            DataKeyNames="objectdiaryid" ForeColor="#333333" GridLines="None" OnRowCancelingEdit="GridView1_RowCancelingEdit"
            OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating">
            <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <Columns>
                <asp:CommandField HeaderText="Edit-Update" ShowEditButton="True" />
                
            <asp:BoundField DataField="objectdiaryid" HeaderText="objectdiaryid" 
                ReadOnly="True" SortExpression="objectdiaryid" />
            <asp:BoundField DataField="con" HeaderText="con" ReadOnly="True" 
                SortExpression="con" />
            <asp:BoundField DataField="shortdescription" HeaderText="shortdescription" 
                SortExpression="shortdescription" />
            <asp:BoundField DataField="description" HeaderText="description" 
                  ReadOnly="True" SortExpression="description" />
            <asp:BoundField DataField="Date From" HeaderText="Date From" ReadOnly="True" 
                SortExpression="Date From" />
            <asp:BoundField DataField="Date Till" HeaderText="Date Till" ReadOnly="True" 
                SortExpression="Date Till" />
            <asp:BoundField DataField="Total Number of days off" 
                HeaderText="Total Number of days off" ReadOnly="True" 
                SortExpression="Total Number of days off" />
                     <asp:CommandField HeaderText="Delete" ShowDeleteButton="True" />
            </Columns>
          
            <RowStyle BackColor="#E3EAEB" />
            <EditRowStyle BackColor="#7C6F57" />
            <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
            <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
            <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="White" />
        </asp:GridView>

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