I'm working on some .NET code in visual studio web developer and I'm having an issue. When I double click on a button in design view, instead of loading a subprocedure, all it does is highlight this: <asp:Button ID="btnEnter" runat="server" Text="Enter" onclick="btnEnter_Click" />
When I try to run that just to see what happens, I get this error:
Line 8: <asp:Button ID="btnEnter" runat="server"
Compiler Error Message: BC30456: 'btnEnter_Click' is not a member of 'ASP.default_aspx'.
If I erase the onclick="btnEnter_Click" and run it, it works. Either way though, when I double click the button / element, shouldn't it create a subprocedure for me that looks something like?
Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
End Sub
I've tried entering that manaully but the keywords don't turn blue or any sort of color, and when I run it, it just shows up as text on the webform with my other elements. Here is all I have so far:
<%# Page Title="Home Page" Language="VB"%>
<form id="form1" runat="server">
<asp:Label ID="Label1" runat="server" Text="Enter a person's name below"></asp:Label>
<p>
<asp:TextBox ID="txtStudentName" runat="server"></asp:TextBox>
</p>
<p>
<asp:Button ID="btnEnter" runat="server"
Text="Enter" onclick="btnEnter_Click" />
</p>
<p>
<asp:Button ID="btnDisplay" runat="server" Text="Display all and exit" />
</p>
<p>
<asp:Label ID="lbl2" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl3" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl4" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl5" runat="server" Text=" "></asp:Label>
</p>
</form>
Edit:
When I enter my code inside the default.aspx.vb file, it highlights keywords and such, but it can't reference the elements I created in the design view.
Partial Class _Default
Inherits System.Web.UI.Page
End Class
Class Lab1
Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
End Sub
Public Const length As Integer = 3
Shared counter2 As Integer = 0
Public Shared studentList As String() = New String(2) {}
Protected Sub btnEnter_Click(sender As Object, e As EventArgs)
Label1.Text = "Enter a person's name"
Dim studentName As [String] = txtStudentName.Text
If studentList.Length <= length Then
If txtStudentName.Text <> "" Then
Dim match As [Boolean] = True
Dim i As Integer = 0
While counter2 >= i
If studentList(i) IsNot Nothing Then
If studentList(i).ToUpper() = txtStudentName.Text.ToUpper() Then
match = False
Label1.Text = "This name has already been used"
End If
End If
i += 1
End While
If match = True Then
studentList(counter2) = txtStudentName.Text
counter2 += 1
End If
End If
End If
End Sub
End Class
Your Page declaration seems to say you are using inline style:
<%# Page Title="Home Page" Language="VB"%>
Which means your code is/should be within aspx file itself in a script runat="server" tag:
<%# Page Language="VB" %>
<!DOCTYPE html>
<script runat="server">
Protected Sub Button1_Click(sender As Object, e As EventArgs)
'Do something
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</div>
</form>
</body>
</html>
However, your other code indicates you seem to want to use code-behind model, where you have .vb files (e.g. foo.aspx.vb)
The Page is declared like this for web sites (for web applications it will say CodeBehind="foo.aspx.vb"):
<%# Page Language="VB" AutoEventWireup="false" CodeFile="foo.aspx.vb" Inherits="foo" %>
You will find a foo.asp.vb file in your project
it's class name will be the name of your file (foo)
your code should be scoped to this class (I'm not sure what Class Lab1 in your post above is for....
foo.aspx.vb:
Partial Class foo
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Do something
End Sub
End Class
The "fix" is for you to:
choose which model you want to write code: inline or code-behind
declare the Page appropriately
for inline, your code will be in the aspx file itself
for code-behind, your code will live, and should be encapsulated within the Class file of the page.
The Page declaration actually says so:
CodeFile="foo.aspx.vb" is the file where the code is
Inherits="foo" is the Partial Class in the file (Partial Class foo)
Try this
Private Sub btnEnter_Click(sender As Object, e As System.EventArgs) Handles btnEnter.Click
End Sub
Here, btnEnter_Click is your event name and use the Handles keyword at the end of a procedure declaration to cause it to handle events raised by an object variable
Related
My friend ahs created an ASP.net C# based webservice which takes a parameter - ProjectNumber and returns set of data. I want to consume this webservice in my VB.net project. So I added the webservice as a webreferdence to my vb project as below:
My default.aspx looks as below:
<head runat="server">
<title>Trial application</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<p>enter project numbers:
<asp:TextBox ID="TextBox1" runat="server" Width="402px"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" />
</p>
</div>
</form>
</body>
</html>
On button click I want to pass textbox value as parameter to the webservice:
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim projectId As String
projectId = TextBox1.ToString()
Dim GetProjectDetails As GetProjDetails = New GetProjDetails 'GetProjDetails-webreference name
Dim result = GetProjectDetails.projdet(projectId)'Getprojdet is the method inside the webservice
Console.WriteLine(result)
End Sub
But I am seeing "type expected" error with this. Not sure how to fix. Any help?!
I am using the the Neodynamic SDK to print documents to the client side.
We will have 5 documents to print. I see how to print either 1 document or print all documents, but is there a way to print 1 document per button. I.e. button1 prints out doc1, button2 prints doc2, etc.
Here is what I've got so far
<script runat="server">
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs)
fileone()
filetwo()
End Sub
Public Sub fileone()
Dim fileToPrint As New PrintFile(Context.Server.MapPath("~/forms/xmlheader.txt"), "xmlheader.txt")
If (WebClientPrint.ProcessPrintJob(Request)) Then
'Create a ClientPrintJob
Dim cpj As New ClientPrintJob()
'set client printer, for multiple files use DefaultPrinter...
cpj.ClientPrinter = New DefaultPrinter()
'set files-printers group by using special formatting!!!
'Invoice.doc PRINT TO Printer1
cpj.PrintFile = fileToPrint
'send it...
cpj.SendToClient(Response)
End If
End Sub
Public Sub filetwo()
Dim fileToPrint As New PrintFile(Context.Server.MapPath("~/forms/ How To Recover Office Doc.pdf"), " How To Recover Office Doc.pdf")
If (WebClientPrint.ProcessPrintJob(Request)) Then
'Create a ClientPrintJob
Dim cpj As New ClientPrintJob()
'set client printer, for multiple files use DefaultPrinter...
cpj.ClientPrinter = New DefaultPrinter()
'set files-printers group by using special formatting!!!
'Invoice.doc PRINT TO Printer1
cpj.PrintFile = fileToPrint
'send it...
cpj.SendToClient(Response)
End If
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
fileone()
ScriptManager.RegisterStartupScript(Me, Me.GetType(), "printForm1", "printForm1();", True)
End Sub
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
filetwo()
ScriptManager.RegisterStartupScript(Me, Me.GetType(), "printForm2", "printForm2();", True)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>How to print multiple files to client printers from ASP.NET</title>
<script type="text/javascript">
function printForm1() {
jsWebClientPrint.print(fileone());
}
function printForm2() {
jsWebClientPrint.print(filetwo());
}
</script>
</head>
<body>
<%-- Store User's SessionId --%>
<input type="hidden" id="sid" name="sid" value="<%=Session.SessionID%>" />
<form id="form1" runat="server">
<h1>How to print multiple files to client printers from ASP.NET</h1>
Please change the source code to match your printer names and files to test it locally
<br /><br />
<%-- Add Reference to jQuery at Google CDN --%><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js" type="text/javascript"></script><%-- Register the WebClientPrint script code --%><%=Neodynamic.SDK.Web.WebClientPrint.CreateScript()%>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button"
Height="156px" Width="156px" />
<asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Button" Height="156px" Width="156px"/>
<asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="Button"
Height="156px" Width="156px"/>
<asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="Button"
Height="156px" Width="156px"/>
<asp:Button ID="Button5" runat="server" onclick="Button5_Click" Text="Button"
Height="156px" Width="156px"/>
</form>
</body>
</html>
I thought of changing filetwo() variable to clientprintjob cpj2...
What you need is to make a function called PrintDoc() that receives the path of the file to print as a parameter. The signature should look like this:
Private Sub PrintDoc(path as String)
End Sub
You only need this function once and no need for sub fileone() and sub filetwo() ... up to filefive(). You just need this one sub called PrintDoc(path as String)
Then you need 5 buttons, each with their own _Click() event and in that event handler you call the PrintDoc procedure by passing a different param everytime.
Hope this helps.
Good luck!
I'm trying to revisit this as I can't seem to find an answer. I have created a User Control which works awfully well when I hard code in the Parent_ID. However, I'd like to have the Parent_ID assigned dynamically according to a value from a GridView's row.
Here is the User Control's CodeBehind:
Public Class Comments
Inherits System.Web.UI.UserControl
Public _name As String
<System.ComponentModel.Bindable(True), System.ComponentModel.Browsable(True)> _
Public Property Parent_ID() As String
Get
Return _name
End Get
Set(value As String)
_name = value
End Set
End Property
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
If Parent_ID Is Nothing Then Parent_ID = "-1"
DataSource_Comments.FilterParameters(0).DefaultValue = Parent_ID
'lbl_Parent_Alert.Text = "Parent_ID: " & Parent_ID
End If
End Sub
End Class
ASP.net aspx page:
<%# Page Title="About Us" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false"
CodeBehind="About.aspx.vb" Inherits="MOO.About" %>
<%# Register TagPrefix="uc" TagName="Comments_Control" Src="~/Comments.ascx" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:SqlDataSource ID="DataSource_Missed_Yesterday" runat="server"
ConnectionString="<%$ ConnectionStrings:MainMOOConnectionString %>"
SelectCommand="SELECT * FROM func_Missed_Yesterday() Order By Total_Price DESC"
>
</asp:SqlDataSource>
<asp:GridView ID="GV_Missed_Yesterday" runat="server" DataSourceID="DataSource_Missed_Yesterday"
AutoGenerateColumns="false" CssClass="Grid_View">
<Columns>
<asp:BoundField DataField="num_Order_Num" HeaderText="Order Number"/>
<asp:BoundField DataField="mem_Order_Notes" HeaderText="Order Notes"/>
<asp:TemplateField HeaderText="Order Notes">
<ItemTemplate>
<asp:Label ID ='lbl' runat="server" text='<%#Eval("num_Order_Num") %>'/>
<uc:Comments_Control id="Comments_Control_ID" runat="server" Parent_ID='<%#Eval("num_Order_Num") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</asp:Content>
Aspx.vb page:
Imports System.Data
Public Class About
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Sub GV_Missed_Yesterday_DataBound(sender As Object, e As GridViewRowEventArgs) Handles GV_Missed_Yesterday.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
End If
End Sub
End Class
Again, if I hard code this line:
<uc:Comments_Control id="Comments_Control_ID" runat="server" Parent_ID='<%#Eval("num_Order_Num") %>' />
As:
<uc:Comments_Control id="Comments_Control_ID" runat="server" Parent_ID='1162519' />
I see the appropriate comments for Order 1162519. When I leave it as Eval("num_Order_Num"), I get nothing.
I thank you in advance for pointing me in the right direction.
Thanks,
Rob
I could be wrong, but I believe that the controls in a template are first created (at which time your Page_Load event handler would run in the user control) and then any binding language expressions are evaluated. So by testing the value of Parent_ID in the user control's Page_Load routine, you're catching it too early.
Try using the PreRender event instead of the Load event to test Parent_ID for a value. That will execute right before rendering, well after any binding expressions have been evaluated.
Yeap... Ann L. was correct. The controls in a template are created first than the binding event.
You could also use the GV_Missed_Yesterday_DataBound method, if you couldn't use the PreRender. Some cases, you must do the operations before the prerender.
So you could set the Parent_ID for the control at the DataBound method and also create a method in the Comments_Control that executes the code :
DataSource_Comments.FilterParameters(0).DefaultValue = Parent_ID
For the same problems most of times there is a lot of possible solutions.
I've written this new solution in order to satisfy anyone who face the same problem but can't use the PreRender event.
You need to do a Page.DataBind() on the page load of your User Control.
I am trying to understand UpdatePanels and best practise for using them.
I am using .Net4.0 with VB.Net.
The idea is to create a conversation app for a clients website and so I have control called Convo.ascx. Code added below.
<asp:UpdatePanel runat="server">
<ContentTemplate>
<h2>Conversation</h2>
<p><asp:Literal ID="lit1" runat="server" /></p>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" />
</ContentTemplate>
</asp:UpdatePanel>
Convo.ascx.vb
Partial Class Convo
Inherits System.Web.UI.UserControl
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
lit1.Text = lit1.Text & "<p>" & TextBox1.Text & "</p>"
End Sub
End Class
On a load page (Default.aspx) I have:
<%# Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%# Reference Control="~/Convo.ascx" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:scriptmanager ID="Scriptmanager1" runat="server"></asp:scriptmanager>
<div>
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Add Conversation" />
<asp:PlaceHolder ID="phConversation" runat="server">
</asp:PlaceHolder>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
With Codebehind Default.aspx.vb as
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
AddConvo()
End Sub
Private Sub AddConvo()
Dim getPh As New PlaceHolder
getPh = CType(Me.FindControl("phConversation"), PlaceHolder)
Dim ucConvo As New Convo
ucConvo = CType(LoadControl("~/Convo.ascx"), Convo)
getPh.Controls.Add(ucConvo)
End Sub
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
AddConvo()
End Sub
End Class
So the Convo I add OnLoad remains on the page after extra as been added been any convo added after load is gone once the button on Convo is hit.
So my question is, how can I have these add and remain? Eventually they will be added to database but right now I am trying to understand UpdatePanels as they will become the foundation for this app.
Is there a very good explanation of multi-use UpdatePanels anywhere?
Thanks in advance
PS, im a hobbiest so only VB responses please
The issue actually isn't with the UpdatePanel, but with ASP.NET. ASP.NET web forms uses a control hierarchy for the entire page, and you are adding the controls to the hierarchy "dynamically". Since you are doing it that way, ASP.NET requires you add the control back into the control hierarchy on every postback to the server. The UpdatePanel is a way to post back to the server, and therefore you must re-add the old user controls and new ones to that hierarchy.
Essentially the UpdatePanel was added to make AJAX easy, but you still have to work within the rules of ASP.NET.
I try to create custom control, loaded dynamically from .vb code.
Here is my custom control "ControlCar" in file "controlcar.ascx"
<%# Control Language="VB" ClassName="ControlCar" %>
<script runat="server">
Private m_car As Car = Nothing
Public Property Car() As Car
Get
Car= m_car
End Get
Set(ByVal value As Car)
m_car = value
End Set
End Property
Protected Sub Panel_OnLoad(ByVal sender As Object, ByVal e As System.EventArgs)
If Me.m_car Is Nothing Then
lit_color.Text = "(m_car Is Nothing)"
Else
lit_color.Text = "color of Me.m_car is (" & Me.m_car.Color & ")"
End If
End Sub
</script>
<asp:Panel ID="panel" OnLoad="Panel_OnLoad" runat="server">
this is a car<br />
color = <asp:Literal ID="lit_color" runat="server"></asp:Literal><br />
<br />
</asp:Panel>
Here is my ASP web page in file "cars.aspx" which use .vb code for events, ...
<%# Page Language="vb" Explicit="true" Inherits="PageBase" Src="/code/cars.vb"%>
<html>
<body>
<!-- Html code here --->
<asp:panel ID="panel_cars" runat="server">
</asp:panel>
</body>
And here is my .vb code in file "cars.vb"
Private Sub CreateCar()
Dim car As Car = new Car()
Dim control As ControlCar = Nothing
control= CType(LoadControl("/code/controlcar.ascx"), ControlCar)
control.Car = car
panel_cars.Controls.Add(control)
End Sub
But it fails, saying 'ControlCar' is unrecognized in cars.vb.
I know it works, if move .vb code in .aspx file and using directive
<%# Register TagPrefix="uc" TagName="ControlCar" Src="/code/controlcar.ascx" %>
But I need to separate .vb code and .aspx code like in my example.
How can I make recognizing 'ControlCar' type (defined in .ascx) in .vb file?
You need to add some kind of reference. You can use a reference directive:
<%# Reference Control="controlcar.ascx" %>.
The control is being dynamically compiled. If you have no reference, the compiler has no idea what you are trying to use.
EDIT:
You may be able to use:
Imports ASP.controlcar_ascx
If the reference must be in the code behind. I have had issues with this in the past though.