How To Create New Server Control Type
Jun 19, 2012
I'm trying to create a new server control type in ASP.NET. This control would put a RequiredFieldValidator into a certain place. My class inherits from the WebControl class and it has a ControlID property which is the ID of a given control. The RequiredFieldValidator will be generated near the control with the given ControlID. However, the value of ControlID is nothing. In what events can I successfully use this property?
Public Class MyControl
Inherits WebControl
'...
Protected Property ControlID As String
Protected Property IsLinkedBrother As Boolean = False
[Code] .....
But ControlID is Nothing for some reason and the event throws an exception. ControlID is never changed after initialization and it is initialized this way:
<MyControl runat="server" ID="IDValue" ControlID="ControlIDValue" EnableCliendScript="true" CssClass="Whatever" Display="Dynamic" />
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Jan 20, 2011
If I create a list for a TextBox:
[Code]....
I am able to only add controls that are of type TextBox. My question to you is, can I create a List to hold more than one control type or do I have to create a list for each control type?
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Apr 12, 2011
I have a problem with My dataGridVew. i am trying to export data from my DB to excel fie. it's a small page where there are only data grid view and button to export like this :
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
[CODE]...
When i click on the button error message is coming : "Control 'GridView1' of type 'GridView' must be placed inside a form tag with runat=server.???" even i have placed it in form ?
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Nov 30, 2009
I am trying to create a vertical progressbar type user control.
I want to be able to set the max / min of the progressbar as well as setting the value
But the thing I want is able to have green at the bottom fading into red up the top like in this image: [URL]
But I don�t know how or where to start.
Is there a custom progressbar I can use?
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Nov 29, 2011
Is it possible to create a user control with a list of custom class type property? If it is, how can I? The issue is that, in designer mode the property is not displayed in property window. I can add the list on markup but when i switch to the designer mode it gives an error which is 'The user control does not have a public property named BookList'.
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Aug 1, 2011
Im new to .Net and I wondering if you have to re-create a table server control on every postback. I'm having a problem when a user clicks a button which adds a row to the table. It works fine up to about 50 rows being added then the page is extremely slow. [code]
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Dec 22, 2010
In the following example I m getting a response from the server; however do I need to set ASCII or UTF8 encoding type ?
Dim objURI As Uri = New Uri(URL)
Dim wReq As WebRequest = WebRequest.Create(objURI)
Dim wResp As WebResponse = wReq.GetResponse()
[code].....
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Jul 21, 2011
I am trying to create a simple chat server over vb that can relay messages back and forth using an echo server. Could someone point me in the correct direction to begin?
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Jun 11, 2012
I need to create a function which have either 1 parameter with a string as data type or 2 parameters with double as data type.Something like the substring method.
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Dec 16, 2011
I am trying to make it so when I use Me.Controls("Timer1") for example I can access specific commands for a timer such as Stop() Start(), I tried CType() and typed in "Timer" as the type but it says the control type can't be converted to the "Timer" type.
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Jun 11, 2012
I'm developing a program with a team in Visual Basic 2010.
What i wanna do is to create a textbox (inherits from textbox) with additional one property called MDIStatusInformation which is used to display a tooltip text in a status bar at main MDI form.
When i use this tag <Browsable(True)> _, the control property not list anything there.
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Jun 10, 2011
I have a property active to indicate status of an employee. Along with all the details, i extract the details from an employee table into a dataset, but however i am not able to get the value present in active as i get an invalid cast exception.
This is the property declaration.
CODE:
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May 9, 2011
Reading bit type sql server db column from dataset
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Aug 13, 2009
I have done VBscripting the past and I have actually made this work in a script however I am trying to convert it to VB for the client so that it has a nicer interface and basically is a better program. There are several parts to this program but I am stuck on this part right now. I am attempting to get a list of all servers from Active Directory and then sort them by type. The program will run however it will not produce any results. Its just an empty file. I figured the problem was with my filtering but I just don't understand why this will not work. I have written it in two different ways and get the same result each time.
Imports System.DirectoryServices
Imports System.DirectoryServices.ActiveDirectory
Imports ActiveDs
[Code]......
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Jan 18, 2010
I am using sqlserver2005.Table1 has a column named bill_no and its type is textNow I want to change its type "Numeric"When I do this the it displays this error message
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Jun 21, 2012
i have data gridview content col name GUID and i put in it GUID value be this code DGrid.CurrentRow.Cells("GUID").Value = System.Guid.NewGuid.ToString() and when i try to add the row from datagrid to database MS SQL SERVER filde type uniqueidentifier by this code
Rs("GUID").Value = DGrid.Rows(m).Cells("GUID").Value
i face below problem Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.
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Aug 25, 2011
I'm trying to create an auction site using asp.net. My auction's start date & time and end date & time are stored in my sql server 2008 r2 database as datetime types. I'm using vb.net. I'm trying to create a select statement in which I can query the date and time portion relative to the current date and time (so as to only display current ongoing auctions). I can successfully query the date portion using the Date.Now function, but the time is giving me a hassle. DateAndTime.Now doesn't work. I've even tried to separate the time and date in the database, but I still can't get an effective query. Here are two examples of code which I've tried:
[Code]...
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Aug 8, 2010
I'm using VS2010, vb.net, .net framework 4.0, and SQL Server 2008 Express on Windows 7 Pro with all updates installed. I have developed a website that uses memberships, profiles, and roles. I allowed the built in providers to create the aspnetdb.mdf file for me in the App_Data folder. I added a number of my own tables to aspnetdb.mdf so I would have a single database for all my site's data.
I am hosting the site on my own server. It uses Windows 2003 Server, IIS 6, SQL 2008 Express, and all of my software including the OS is up to date with the the latest servicepacks, updates, and all of the .net framework updates including 4.0. There are no updates left to install and I'm sure that my issue isn't due to a missing update or framework version.
I copied the aspnetdb.mdf and .ldf files from my app_code folder to the sql server express folder on my server and attached the database. I do this because I don't want the file to autoattach, because I will likely use a commercial hosting service in the future. I added a sql server user with ownership rights to the DB. strong text
I then modified my connection string in web.config to point to the UNC of my SQL Instance on my server and to authenticate with the sql server username and password that I set up with ownership rights to that database. I updated my membership, role, and profile providers in my web.config file to use the new sql connectionstring and I was sure to include the application="/" setting and to use before each provider.
I can run the site just fine from my development machine. I can log on to it and use all of its features. However, when I publish the site to my server I can access the site, both locally over my intranet and over the internet. I can navigate around on it and it retrieves all of the data from the tables that I added to the database myself, but when I try to log on to it or to create a new account (basically anything that uses memberships, roles, or profiles) the site crashes with the error and all of the data below.
I've checked to verify that the application name in my aspnetdb database is in fact simply "/". I've ensured that I'm running from an application pool that is using the 4.0 framework. Much of the googling and reading that I've done seems to indicate a problem with my providers, but I can't understand why it works perfectly on Casini (or whatever the development server is called) on my local machine but crashes on my web server. In both cases they are connecting to the same database.
I would be so grateful if anyone could tell me what I'm doing wrong here. Following are the full error displayed by my server when the site crashes and also what I feel are the relevant sections of my web.config file.Full content of error message and relevant sections of web.config are below:
Server Error in '/' Application.
Value cannot be null.
Parameter name: type
[code]....
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May 22, 2011
I am writing a VB.net client to write to and read from a named pipe in byte transmission mode.I learned from the MSDN article that CallNamedPipe() only works for message-type named pipes.
So do I have other choices, or do I have to change the pipe server code to message type.
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Mar 17, 2009
Decimal type columns have Precision and Scale where the length of the integral part of the decimal would be Precision - Scale, if the Precision is 4 and the Scale is 2 then the integral part can only contain 2 digits (4-2). As such I will probably need a control that I could set how much it should accept on its integral part. In that regard I am not sure which control is best for such cases, I could try to make a usercontrol that will handle that but is there any other control out there that I could utilize for this purpose, intrinsic to .Net or a custom control out there? I could also just validate the data keyed-in but the above solution seem to be more user-friendly. Curiously, when databinding such Decimal type columns, how is it handled when the specified integral part exceeds the allowable size (Precision minus Scale)?
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Nov 9, 2010
I want to create customized control on DataGridView Control in Vb.Net. But I am facing too many problem. How to create dynamic rows and columns and columns like
DataGridView Combo Column (extended combobox)
DataGridView Memo Column
DataGridView DateTimePicker Column
[Code]....
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Jul 12, 2010
I'm having issues with the way I've been reading my image datatype blobs from my SQL database (code below). This code works fine when I access this page directly. The PDF will open and works just fine. However, when I try to use this page to download a file and save it to the file-system programmatically, it fails (500 server error) and I've verified that it's the same URL either way.So, my question is what is the best way to download a file from a database image datatype and save it to disk?PDF.aspx
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Collections.Generic" %>
<script runat="server">
[code].....
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Nov 15, 2011
basically i just want client to say "C: emp" ENTER
then, server must reply with all its files in c: emp
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Jun 5, 2011
I have created a UserControl Popup window and called that xaml file into another file. Imported the namespace.When I am trying to build this project an error at this below given code:
<Popup x:Name="POP" IsOpen="False" PlacementTarget="{Binding}" Placement="Center" AllowsTransparency="True">
<a:PopUpWindow x:Name="pp" />
</Popup>
Error at
<a:PopUpWindow x:Name="pp" />
Could not create an instance of type 'PopUpWindow'.
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Oct 31, 2009
there anyway that we can create our own primitive type? let's say we call this
Code:dim test = 4 then test will automatically be an integer right but i wanted this
Code:dim test = 4% and i want test not to be an integer, but a percentage_integer, in other words, my own primitive type. is that possible?
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Sep 17, 2009
I have some code like:
Lookup(Of String)("Testing")
Lookup(Of Integer)("Testing")
And both of those Lookups work great. What I'm trying to is call the appropriate LookUp based on the type of another variable. Something that would look like...
Lookup(Of GetType(MyStringVariable))("Testing")
I've tried to Google this but I'm having a hard time coming up with an appropriate search.
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Feb 14, 2012
I am creating a server-client type application that allows the network administrator to perform tasks on remote computers by using TCP sockets (TCPClient and TCPListener).The server application needs to send out a message to a client machine (with client application installed) and from this, the client application will send back the required data (i.e. system info, task progress etc). This part works fine.However, I am having trouble in getting the client application to constantly listen for an information request in the background. It should be listening whenever the application is running. What I want to do is to have an event handler which, when a message comes through, acts upon the instructions to send the relevant information back. The server does not need to constantly listen for data, as it will only receive data after it has sent a request.
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Jun 23, 2011
I try to describe my problem step by step because I do not know how to say it in correct programming terms.
When I use a System.String type, I do the following:
Declare the type: Dim Str1 as String
Assign its value: Str1 = "This is a string"
I want to create a new type that just like the System.String type but in different name. For example, I want to create a UrlString type for string like this:
Declare the type: Dim Str2 as UrlString
Assign its value: Str2 = "http://www.example.com"
My question is: How do I create the UrlString type?
The reason: I want to create the UrlString type to help me to identify the value of the content. For example, UrlString type means the string is in url format, PhoneString means the string is in phone format, CreditCardString type means the string is in credit card format and so on.
Class UrlString
Private ReadOnly value As String
Public Sub New(ByVal value As String)
[Code].....
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Aug 22, 2011
Following this tutorial: http:[url].....It works in a test project of mine, but in my production project I get the following error: Server Error in '/products' Application.
Unable to create type 'Photocreator.ThemedPageAdapter'.
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.Exception: Unable to create type 'Photocreator.ThemedPageAdapter'.
Source Error: An unhandled exception was generated during the execution of the current web request.Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[Exception: Unable to create type 'Photocreator.ThemedPageAdapter'.]
System.Web.Configuration.HttpCapabilitiesBase.GetAdapter(Control control) +889
System.Web.UI.Control.ResolveAdapter() +214[code].....
This appears on all pages, both projects are using framework V4.
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Jan 19, 2009
I want to create a constant of type date and assign it a list of 3 date. How can I assign a list of values to a constant. const dates as date=#1/1/2009#, #5/1/2009#.....
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