.net - Dynamic Call To A Database From Web Application?
May 16, 2012
I am looking to make a database call based on user input. The line I am using is:general_read.CommandText = "SELECT * FROM general WHERE Business_Name = '" & business_name & "';"
business_name is dynamically loaded from:Protected Sub btnLoad_Click(sender As Object, e As System.EventArgs) Handles btnLoad.Click business_name = txtName.Text
[Code]...
The error that is being shown is: Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.I'm assuming it has something to do with the variable not being set before the database call is made, but I'm not entirely sure.
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Mar 22, 2012
I want to create an ExpressionTree where a Func(of Vector, Vector, Vector, Vector, Double, Double, Vektor) should be called. So I use
Expression.Call(Forces(0).Function.Method, {Vec1, Vec2, Vec3, Vec4, Double1, Double2})(Vec1-4, Double1-2 are declared as ParameterExpression and Forces(0).Function as Func(of Vector, Vector, Vector, Vector, Double, Double, Vector). But I get an AgrumentException, because Forces(0).Function.Method has seven Arguments. (System.Runtime.CompilerServices.Closure as seventh argument at Index 0).
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May 2, 2012
How do you select a chart based on its name? I have a number of charts in a form and I need to assign data to particular charts at particular times. I would like to have a simple code sequence to assign data to the appropriate chart depending[code]....
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Oct 28, 2011
Names of entities have been altered to protect their identities...
I've created a class called AnimalSearch(Of AnimalType As Animal(Of Int32))
Public Class AnimalSearch(Of AnimalType As Animal(Of Int32))[code]...
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Mar 12, 2009
I work with Access and VB6 for quite a while. I have read the thread of Phillip Maerz, but there was still the problem that the Function names had to be written in the delegate array. Thats why I started a new thread.Following Problem:How can I call a funktion dymacally, something like thisPublic Function Test1()Returns 1End Function Public Function Test2()Returns 2End Function Sub Main()dim i, r as integeri=2
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May 3, 2011
I'm trying to implement multicolumn filtering using LINQ expressions in a class that extends BindingList(Of T). Here is the relevant code:
Public Function GetFilterPredicate() As Func(Of T, Boolean)
Dim expressionList As List(Of Expression) = New List(Of Expression)
For Each item as FilterInfo in _FilterList
[code]....
However, an exception is thrown at the Expression.Call statement. I can't quite figure out the right arguments to supply. As it is now, I am getting this error when I run the code:
InvalidOperationException was unhandled:No generic method 'Equal' on type 'System.Linq.Expressions.Expression' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic.
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May 17, 2011
I connected to the Informix server using RazorSQL, created a stored procedure and tested it, getting the expected answer, so the procedure exists in the database in some form.
I then run the following code:
If ConnectToInformix() Then
Dim cmd As New IfxCommand("dc_routeHasOutstandingQuantity", conn)
cmd.CommandType = CommandType.StoredProcedure
[Code]....
This error does not occur when calling the stored procedure from a live SQL connection.
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Mar 24, 2010
how to convert an existing Standalone Java Application to a Dynamic WEB Application which can be deployed on Apache-Tomcat Server container ?
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Aug 2, 2011
I have a windows forms application written in VB.NET which scrapes information from serveral web pages (who doesn't right)? Anyway, I am having problem with one particular site where partway through the page navigation my application hangs. When I press pause (or break) in the debugger, it stops on a call to System.Windows.Forms.Application.DoEvents.
Resuming execution shows that it really is stuck on this line (it does not reach the next line of code). It also hangs about the same point each time I run it (at least its consistent). Since System.Windows.Forms.Application.DoEvents yields to other threads on the same processor and then resumes execution of the current thread, I think the problem is that some other thread is not behaving well (not returning from some event handling code). I thought Windows 7 was pre-emptive, which makes me
doubt that theory but I really don't know.
[Code]...
The program scrapes somewhere between 12 and 14 pages before it gets stuck on the call to DoEvents. Does anyone have a clue why this would happen? Why would any call to DoEvents hang?
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Aug 17, 2011
I Have one Windows Application in which i have one MDI Form (Say App1). And I too have another Windows Application in which I have a Child Form (Say App2). So now i want to Call App2 from App1 .. And want to Display App2 form As MDIChild in App1 MDI Form . I am Able to open the Form of App2 , But how to set It As App1' Child .
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Aug 27, 2010
I'm going to make a Skype application using Visual Basic, I use them "Skype4COM.
Below is a link on the page somewhere in the middle Skype4COM. It is the DLL that I use.
But my question is, how can I in my application that I call you? Not that you're on the phone but if someone phoned you before you've pressed record.
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Jul 7, 2011
I have the following snippet:
liNoSheets = My.Resources.NoSheets
ReDim lsSheetName(liNoSheets - 1)
lsSheetName(0) = My.Resources.Sheet1Name
[Code].....
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Mar 4, 2010
I am using the following code to establish a database connection to my datagridview and Access database. Here I am giving my file path name to the connection. This code works fine only on my computer. To make this code run on another computer I need to change the database pathname in the code. Is there anyway I can make this connection dynamic so that I can make this program run on any computer
Dim Data1 As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data source=C:\Users\Desktop\Work\Visual basic\alldata.mdb")
Dim Case1 As OleDbCommand = New OleDbCommand("SELECT * FROM case1", Data1)
[code]......
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Mar 3, 2009
I need to throw together a quick CRUD asp.net site, but this may become a bigger application down the road. I have some experience with SubSonic, but it has been so long since I did a project with it I have to relearn it. I am also considering using Dynamic Data.
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Mar 26, 2010
Currently i only managed to implement the google map(static) into my application,but i want to replace it with a dynamic map. Is there any website or example for me to refer? I tried reading up google API website, but i still dont get it.
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Nov 21, 2009
I'm starting using a project for smart device in windows CE 5. I'm using visual basic of v. studio 2008.I need to create a dynamic connection between a PDA (codebar lector) and an server with ORACLE 9i. The PDA connected via WIFI. But in my vb project I don't find OLEDB or ODBC elements.
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Oct 24, 2011
1.How to show Grid vertical and horizontal grid lines in windows application.2.How to stretch complete graph control placed on the form as per the resizing of the form.3.How to draw arc(curve shape) with start and end point with known radius and angle.
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Jun 14, 2011
I am building a program to keep tract of student signup and classesroom.
1.I have an admin form that gives the admin users the right to create a classroom. This class is available / show up when the student signup. Because of future plans I want the admin to have the right to add / delete and classroom if the class is no longer needed to offering.
When a student signup the available class will show up in a datagridviewer and I have added a check box to select the classes taken.
[Code]...
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Jun 3, 2011
I'm trying to use the Shell to have my application call an external application but its not working...I don't understand why. I get the following error: 'System.windows.shell' is a namespace and cannot be used as an expression!
Heres my code....any ideas what I'm doing wrong. Its got to be a simple...stupid error.
Private Sub mnuUpgrade_Click(ByVal Ctrl As Microsoft.Expression.Web.Interop.Legacy.CommandBarButton, ByRef CancelDefault As Boolean) Handles mnuUpgrade.Click
[CODE].....................
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Nov 12, 2009
My problem is when i try to call Application.Run() in a application without a form i get "Object reference not set to an instance of an object." when i run it outside VS. but if ran in debug or release mode it works just fine. i may just be forgetting to setup application right, but ive done it before in this same manor and it worked fine.
Sub main() 'this runs first.
AddHandler Application.ApplicationExit, AddressOf ExitEventHandler
dbg_f("handle added")
[CODE]...
Commented out init_timer and init_ready, and now it causes the same error for the myName line. there seems to be something wrong with class Application. btw theres seems to be something wrong with the forum code formatting.
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Nov 15, 2009
I'm trying to construct a database driven VB.Net app that pulls a list of registered accounts from a database and displays the usernames of throes accounts in menu, so the user can select one and a new form open (where they work with it).what I have so far is the constructor for the MDI parent window.[code]What I want to happen is when a user clicks on the context menu a new MDI child form is created and the data in user is passed, however because AddressOf doesn't like passing data this doesn't work.I've looked at delegates and landa expressions but don't think either of them do what I need, the other option is to make my own subclass of the ContextMenuStrip class, which 1) handles the clicks the way I want to and 2) sounds like a nightmare.Before I launch into what I think will be a hell of a lot of work, am I missing something? is their a simple way to do what I want to do? or if not will sub-classing ContextMenuStrip work and if not any ideas as to what will (and if it will, any ideas as to how to start learning how to do that)
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Jan 14, 2009
i am using b.net 2005. i am generating a crystal report. but when i work in a different computer i have to set the location of the database of the report before i generate. is their any dynamic way to set my database location to the report.
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Jan 14, 2009
i am generating a crystal report. but when i work in a different computer i have to set the location of the database of the report before i generate. is their any dynamic way to set my database location to the report.
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Apr 11, 2009
How do I call/use a VB6 dll in VB.NET application? Welcome to the All-In-One Code Framework! If you have any feedback
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Aug 5, 2011
I am looking to create an order reference which is something like this
PLC0000001
Where the 1 would be my order id
but lets say it gets to 100 would like
PLC0000100
In VB.NET how could I build up a string like where i know i.e.
the starting part = PLC
Ending part = Order ID
middle = fill in 0's
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Feb 23, 2010
how to use a dynamic table for my MS SQL database? Im using vb.net 2008...any idea on how to do it?
e.g. - Output
ID LastName FirstName Address Order
001 Doe John Kentucky 10-10
002 Smith Jack Kansas 10-11
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Jun 5, 2010
I'm relatively new to the vb.net framework and object oriented programming. After perusing the threads for a few hours I can't quite find an answer so I'm posting this thread. I'm not necessarily looking for code examples. I just want to know if it's possible and where to look next. Basically I'm trying to build a starter application that will help me learn programming. One of the main things I want to do is to be able to dynamically (at run time) create a set of information (data) that can be manipulated via a set of static (and/or dynamic) functions/calculations. The reason I need it to be dynamic is because even though this program is really just for my own fun and perusal on my own machine (and I want it to be able to run without any outside connections (i.e. databases or servers) the data itself is going to be location (i.e.State of residence or even city) specific. Essentially most of the data will be numerical and can be of the integer type. But I'd like to be able to adjust and create new data sets if desired. From everything I've read and researched I haven't found a way to do this (at least now without an excessive amount of coding that is above my expertise). So I want to know if there is a way to do this that is relatively simple.
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Oct 12, 2010
I need to call a VB.NET DLL in VB6 application
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Dec 17, 2010
I want to call vb6 exe file on vb.net application that I am currently working on. The VB6 Application has the login screen and I don't want it to be displayed as the start-up screen. As soon as I call the VB6 appl the program must activate the enter key, so that I cannot put the login credentials manually.
So How do I make my program press the ENTER key?
This is my code for calling the vb6 application </Process.Start("C:\Importing.exe")>
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Nov 28, 2010
When I call a different sub from the main sub in my console application, I have to type in the word twice for it to go to the sub. But I have noticed that it only does that when I have it to be recognized at the second instance (I think I used that right). What I mean by that is this.
Sub Main()
if console.readline = "Test1"
call _Exit_()
[Code].....
If I type Test1, it will call the _Exit_ no problem. But if I call _New_, I have to type it in twice.
I also tried putting them both into if statements instead of elseif.
I have also change the order of the calls, this is where it get interesting to me. If I were to change the call from "Test1" to _New_ ()(So, instead of calling _Exit_(), it will call _New_()) If I do this, then the _New_() will work no problem
and I don't have to type it in twice, but I do for the _Exit_() now.
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