i have a problem with this error(this error related edit and delete button,when i click this button in datagrid..i will get this error)"Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation." this is my code : <%@ Page Language="VB" Debug="false" %> <%@ import Namespace="Sytem.Data" %> <%@ import Namespace="System.Data.OleDB" %> <script runat="server"> Sub Page_Load(Src As Object, E As EventArgs) Dim ds As new System.Data.Dataset Dim dbconnection as System.Data.OleDb.OleDbConnection try Dim WhereIsTheDatabase as String = System.Web.HttpContext.Current.Server.mappath("./LeaveDB.mdb") Dim dbstr as String= "Provider=Microsoft.Jet.OLEDB.4.0; Data Source="&WhereIsTheDatabase &";User ID=admin ;Password=" dbconnection=New System.Data.OleDb.OleDbConnection(dbstr) Dim dbcommand As New System.Data.OleDb.OleDbCommand Dim da As New System.Data.OleDb.OleDbDataAdapter dbconnection.Open() dbcommand.CommandText="SELECT * FROM Leave Order By Leave_ID" dbcommand.Connection=dbconnection da.SelectCommand=dbcommand da.Fill(ds) Catch Ex as Exception throw new Exception("Error detection" &Ex.Message) finally dbconnection.Close() End Try dtgridLeaveList.DataSource=ds dtgridLeaveList.DataBind() if ds.Tables.count > 0 then Dim dt as System.Data.DataTable = ds.Tables(0) dtgridLeaveList.DataBind() else MyJSLabel.text = "<script>window.alert('No Record in the Access file.')</"&"script>" End if End Sub Sub UpdateList(Byval Source As Object,Byval e as DataGridCommandEventArgs) If e.CommandName="Edit" Then Dim LeaveID as Integer=CInt(val(CType(e.Item.FindControl("lblLeaveID"), Label).Text)) Dim DateApplied As String=CType(e.Item.FindControl("lblDateApplied"), Label).Text Dim ICNO as String = CType(e.Item.FindControl("lblICNO"), Label).Text Dim DaysMax as Integer= CInt(val(CType(e.Item.FindControl("lblDaysMax"), Label).Text)) Dim LeaveStart As Date=CDate(CType(e.Item.FindControl("lblLeaveStart"), Label).Text) Dim LeaveEnd As Date= CDate(CType(e.Item.FindControl("lblLeaveEnd"), Label).Text) Dim TypeofLeave As String=CType(e.Item.FindControl("lblTypeOfLeave"), Label).Text Dim Reason As String=Ctype(e.Item.FindControl("lblReason"), Label).Text Dim NoOfDays as Integer=CInt(val(CType(e.Item.FindControl("lblNoOfDays"), Label).Text)) Dim BalanceAnnualLeaveCF as String=CType(e.Item.FindControl("lblBalanceAnnualLeaveCF"), Label).Text Dim BalanceAnnualLeaveBF as Integer=CInt(val(CType(e.Item.FindControl("lblBalanceAnnualLeaveBF"), Label).Text)) Dim AnnualLeaveEntitle As Integer= CInt(val(CType(e.Item.FindControl("lblAnnualLeaveEntitle"), Label).Text)) Dim TotalAnnualLeave as Integer=CInt(val(CType(e.Item.FindControl("lblTotalAnnualLeave"), Label).Text)) Dim LessAnnualLeaveTaken as Integer=CInt(val(CType(e.Item.FindControl("lblLessAnnualLeaveTaken"), Label).Text)) Dim BalanceAnnualLeave as Integer=CInt(val(CType(e.Item.FindControl("lblBalanceAnnualLeave"), Label).Text)) Dim str as String="LeaveID=" &LeaveID.ToString &"&DateApplied=" &DateApplied &"&ICNO=" &ICNO &"&DaysMax=" &DaysMax &"&LeaveStart=" &LeaveStart & "&LeaveEnd=" &LeaveEnd & "&TypeofLeave=" &TypeofLeave & "&Reason=" &Reason & "&NoOfDays=" &NoOfDays & "&BalanceAnnualLeaveCF=" &BalanceAnnualLeaveCF & "&BalanceAnnualLeaveBF=" &BalanceAnnualLeaveBF & "&AnnualLeaveEntitle=" &AnnualLeaveEntitle & "&TotalAnnualLeave=" &TotalAnnualLeave & "&LessAnnualLeaveTaken=" &LessAnnualLeaveTaken & "&BalanceAnnualLeave=" &BalanceAnnualLeave Response.Redirect("Leave Info.aspx?" &str) End If End Sub Sub OnDelete(Byval sender as Object, Byval e as DataGridCommandEventArgs) If e.CommandName="Delete" Then Dim ds As new System.Data.Dataset Dim dbconnection as System.Data.OleDb.OleDbConnection Dim WhereIsTheDatabase as String = System.Web.HttpContext.Current.Server.mappath("./LeaveDB.mdb") Dim dbstr as String= "Provider=Microsoft.Jet.OLEDB.4.0; Data Source="&WhereIsTheDatabase &";User ID=admin ;Password=" dbconnection=New System.Data.OleDb.OleDbConnection(dbstr) Dim dbcommand As New System.Data.OleDb.OleDbCommand Dim da As New System.Data.OleDb.OleDbDataAdapter dbconnection.Open() dbCommand.CommandText="DELETE FROM Leave WHERE Leave_ID=" &e.Item.Cells(1).Text dbCommand.ExecuteNonQuery dbcommand.CommandText="SELECT * FROM Leave Order By Leave_ID" dbcommand.Connection=dbconnection da.SelectCommand=dbcommand da.Fill(ds) dbconnection.Close() dtgridLeaveList.DataSource=ds dtgridLeaveList.DataBind() End If End Sub </script> <html> <head> </head> <body> <form runat="server"> <font face="Arial Narrow" size="4">(Search Based On Staff I.C No)</font> <font face="Arial Narrow"></font> <font face="Arial Narrow><font size="4">IC.No</font> </font> <asp:TextBox id="TextBox1" runat="server" Width="264px"></asp:TextBox> <font face="Arial Narrow"> </font> <asp:Button id="Button1" runat="server" Text="Search"></asp:Button> (XXXXXX-XX-XXXX) <font face="Arial Narrow">&nbsp;</font> <asp:DataGrid id="dtgridLeaveList" runat="server" OnEditCommand="UpdateList" OnDeleteCommand="OnDelete" AutoGenerateColumns="False" Font-Size="Medium" Font-Names="Arial Narrow"> <SelectedItemStyle backcolor="Blue" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></SelectedItemStyle> <Columns> <asp:TemplateColumn HeaderText="Leave ID" Visible="False"> <ItemTemplate> <asp:Label id="lblLeaveID" text='<%# DataBinder.Eval(Container.DataItem,"Leave_ID") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Date Applied"> <ItemTemplate> <asp:Label id="lblDateApplied" text='<%#DataBinder.Eval(Container.DataItem,"DateLeaveApplied") %>' runat="server"></asp:Label> </ItemTemplate> <HeaderStyle backcolor="White" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></HeaderStyle> <ItemStyle backcolor="White" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></ItemStyle> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="I.C No"> <ItemTemplate> <asp:Label id="lblICNO" text='<%# DataBinder.Eval(Container.DataItem,"ICNo") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Days Max"> <ItemTemplate> <asp:Label id="lblDaysMax" text='<%# DataBinder.Eval(Container.DataItem,"AnnualLeaveEntitle") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Leave Start"> <ItemTemplate> <asp:Label id="lblLeaveStart" text='<%# DataBinder.Eval(Container.DataItem,"Leave_Start") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Leave End"> <ItemTemplate> <asp:Label id="lblLeaveEnd" text='<%# DataBinder.Eval(Container.DataItem,"Leave_End") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Type of Leave"> <ItemTemplate> <asp:Label id="lblTypeOfLeave" text='<%# DataBinder.Eval(Container.DataItem,"TypeOfLeave") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Reason"> <ItemTemplate> <asp:Label id="lblReason" text='<%# DataBinder.Eval(Container.DataItem,"Reason") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="No of Days"> <ItemTemplate> <asp:Label id="lblNoOfDays" text='<%# DataBinder.Eval(Container.DataItem,"NoOfDays") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Balance Annual Leave C/F"> <ItemTemplate> <asp:Label id="lblBalanceAnnualLeaveCF" text='<%# DataBinder.Eval(Container.DataItem,"Remarks") %>' runat="server"></asp:Label> </ItemTemplate> <HeaderStyle backcolor="LightGray" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></HeaderStyle> <ItemStyle backcolor="Yellow" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></ItemStyle> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Balance Annual Leave B/F"> <ItemTemplate> <asp:Label id="lblBalanceAnnualLeaveBF" text='<%# DataBinder.Eval(Container.DataItem,"BalanceAnnualLeaveBF") %>' runat="server"></asp:Label> </ItemTemplate> <HeaderStyle backcolor="LightGray" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></HeaderStyle> <ItemStyle backcolor="Yellow" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></ItemStyle> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Annual Leave Entitle"> <ItemTemplate> <asp:Label id="lblAnnualLeaveEntitle" text='<%# DataBinder.Eval(Container.DataItem,"AnnualLeaveEntitle") %>' runat="server"></asp:Label> </ItemTemplate> <HeaderStyle backcolor="LightGray" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></HeaderStyle> <ItemStyle backcolor="Yellow" font-bold="False" font-italic="False" font-overline="False" font-strikeout="False" font-underline="False"></ItemStyle> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Total Annual Leave"> <ItemTemplate> <asp:Label id="lblTotalAnnualLeave" text='<%# DataBinder.Eval(Container.DataItem,"TotalAnnualLeave") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Less Annual Leave Taken"> <ItemTemplate> <asp:Label id="lblLessAnnualLeaveTaken" text='<%# DataBinder.Eval(Container.DataItem,"LessAnnualTaken") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Balance Annual Leave"> <ItemTemplate> <asp:Label id="lblBalanceAnnualLeave" text='<%# DataBinder.Eval(Container.DataItem,"BalanceAnnualLeave") %>' runat="server"></asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:ButtonColumn ButtonType="PushButton" CommandName="Edit" Text="Edit" HeaderText="Update"></asp:ButtonColumn> <asp:ButtonColumn ButtonType="PushButton" CommandName="Delete" Text="Delete" HeaderText="Remove Record"></asp:ButtonColumn> </Columns> </asp:DataGrid> <font face="Arial Narrow"></font> <font face="Arial Narrow"><font size="4">Total Leave Taken : <asp:TextBox id="txtTotalLeaveTaken" runat="server" Width="35px"></asp:TextBox> Days<asp:Button id="Button3" runat="server" Text="Calculate"></asp:Button> </font></font> <font face="Arial Narrow"> <asp:Button id="Button4" runat="server" Width="82px" Text="Back" Height="26px"></asp:Button> </font><asp:Label id="MyJSLabel" runat="server"></asp:Label> </form> </body> </html>

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