Problem creating dynamic server controls inside Da

iparsigold.you5.net · Apr 28, 2012

Hi, I am trying to create dynamic server controls inside a Template Column in a DataGrid, and I can't understand why I can only set some properties of the control and not others. In the example code below, you can see that I am experimenting with a dynamic TextBox "myTextBox". I successfully managed to set some properties of this TextBox (eg myTextBox.Text = "bla bla bla bla bla"), but sometimes my code seemed to make no difference at all (eg myTextBox.MaxLength = "5") and sometimes it just caused a parser error (eg myTextBox.TextMode = "MultiLine"). But if you look in the SDK documentation under Textbox, you find that Text, MaxLength and TextMode are all listed as properties of a TextBox. So why don't they all work the same way? I have been experimenting with setting properties of other server controls (Label and Hyperlink) dynamically and have found that they too respond in this incomprehensible way - only a few of their properties can (apparently) be set dynamically. This makes no sense, and I'm sure someone out there can explain what's going on! Thanks, JON ************************************************** **************************** The Code ************************************************** **************************** <%@ Page Language="VB" Debug="true" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.Oledb" %> <script language="VB" runat="server"> Dim objConn as New OleDbConnection ( ConfigurationSettings.AppSettings("ConnectionString")) Dim ds as Dataset = New DataSet() Dim objAdapter as New OleDbDataAdapter ( "SELECT * FROM tblItems", objConn ) Sub Page_Load(sender as object, e as eventargs) objConn.Open() objAdapter.Fill(ds, "tblItems") dg.DataSource = ds dg.DataMember = "tblItems" If Not Page.IsPostBack Then dg.Databind() End If End Sub Sub myDataGrid_ItemDataBound(sender As Object, e As DataGridItemEventArgs) 'Only perform this code if we are looking at the Item or Alternating Item If (e.Item.ItemType = ListItemType.Item) or (e.Item.ItemType = ListItemType.AlternatingItem) Dim myTextBox As TextBox = new Textbox() '************************************************* **** 'THESE COMMANDS SEEM TO WORK: '************************************************* **** myTextBox.Text = "bla bla bla bla bla" myTextBox.Columns = "5" '************************************************* **** 'THESE COMMANDS HAVE NO EFFECT: '************************************************* **** myTextBox.MaxLength = "5" myTextBox.Rows = "4" '************************************************* **** 'THIS COMMAND PRODUCES AN ERROR '************************************************* **** myTextBox.TextMode = "MultiLine" e.Item.Cells(4).Controls.Add(myTextBox) End if End Sub </script> <html><body> <form runat="server"> <asp

ataGrid id="dg" runat="server" Bordercolor="black" gridlines="vertical" font-names="Arial" font-size="10pt" cellpadding="4" cellspacing="0" width="100%" ShowFooter="True" HeaderStyle-BackColor="#cccc99" FooterStyle-BackColor="#cccc99" ItemStyle-BackColor="#ffffff" AlternatingItemStyle-Backcolor="#cccccc" AutoGenerateColumns="False" onitemdatabound="myDataGrid_ItemDataBound" > <Columns> <asp:boundcolumn readonly="true" HeaderText="ItemID" DataField="ItemID" /> <asp:boundcolumn readonly="true" HeaderText="ItemTypeID" DataField="ItemTypeID" /> <asp:boundcolumn readonly="true" HeaderText="ItemTitle" DataField="ItemTitle" /> <asp:boundcolumn readonly="true" HeaderText="ItemDescription" DataField="ItemDescription" /> <asp:TemplateColumn> <ItemTemplate> </ItemTemplate> </asp:TemplateColumn> <asp:boundcolumn readonly="true" HeaderText="PostedBy" DataField="PostedBy" /> <asp:boundcolumn readonly="true" HeaderText="PostedDate" DataField="PostedDate" /> <asp:boundcolumn readonly="true" HeaderText="ItemParent" DataField="ItemParent" /> <asp:boundcolumn readonly="true" HeaderText="SortOrder" DataField="SortOrder" /> <asp:boundcolumn readonly="true" HeaderText="ItemRating" DataField="ItemRating" /> <asp:boundcolumn readonly="true" HeaderText="ModeratedYN" DataField="ModeratedYN" /> <asp:boundcolumn readonly="true" HeaderText="JPStillToReplyYN" DataField="JPStillToReplyYN" /> <asp:boundcolumn readonly="true" HeaderText="ArticleOriginalTitle" DataField="ArticleOriginalTitle" /> </Columns> </asp:dataGrid> </form> </body></html>

Problem creating dynamic server controls inside Da

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