I need to add multiple textboxes together and am using Cdbl, my problem is if i have an empty box then conversion can not work, so i have to put zero default in each Textbox, i really dont like they way that looks So i am looking for a way to to give an empty textbox a value of zero so the conversion will work
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Have Two Text Boxes one for "user name" and the other for "password" and also have a MS Access database with three coloums "UserIdNum" which is an auto num, "UserName" and "password" i want it so when i click one button "create user" it adds the data from the two textboxes to the two coloums "UserName and Password". At the min got it working so it adds the "User name" textbox to the "UserName Coloum" but cant find soloution for password.[code]...
View 4 RepliesI have six textboxes that need to have the text saved/loaded. They all have random line amounts under 28 if this info helps at all.
View 7 RepliesPulling a record from the DB and populating a list view but keep getting conversion from DBNull to Single is invalid (words to that effect). The code is below with bold highlighting where problem is and a bit more helpful description of error. I get this error: "Conversion from type 'DBNull' to type 'Single' is not valid." [Code]
View 17 RepliesWe are converting a large VB6 application to VB.net. The problem we have all over the code is the .NET converter did not "reorder" the "IF" and other statements in the code to stop execution when a DBNull value exists. For example, we have code like this all over the place.
"If rRow.Item("av_election_id") > 0 And (rRow.Item("Challenged") <> "SUSPD" Or IsDBNull(rRow.Item("Challenged"))) Then"
This causes a error when "rRow.Item("Challenged") is dbnull
The line of code below corrects this issue but we have thousands of lines of code to reorder and refactor.
If
dtAVVoterRow.Rows(0)("av_election_id") > 0
And (IsDBNull(dtAVVoterRow.Rows(0)("Challenged"))
OrElse dtAVVoterRow.Rows(0)("Challenged")
<> "SUSPD")
Then
creating a wrapper class or something to allow us to keep the first example of code above where it will not throw an error when encountering a Null value? I don't know if a wrapper that reordered the If statements, or captures the error but continues the execution somehow?
I am trying to load an image onto a web form depending on the image's URL path inside a database. I can get this to work, however I am trying to display a dummy image incase the record in the database has no image and the column is NULL.
Below is the code that I imagined would work but I receive an error:
Conversion from type 'DBNull' to type 'String' is not valid.
'// Load Item Image in imgMenuItem Image Control //
If (Not IsDBNull(Rdr("img_url"))) Then
imgMenuItem.ImageUrl = Rdr("img_url")
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The original code:
public List<Contact> GetContactListEntityCompiledLINQ()
{
if (entities == null) entities = new CompanyEntities();
ObjectQuery<Contact> contacts = compiledQuery.Invoke(entities);
if (NoTracking) contacts.MergeOption = MergeOption.NoTracking;
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Error 1 Extension method 'Public Function ToList() As System.Collections.Generic.List(Of TSource)' defined in 'System.Linq.Enumerable' is not generic (or has no free type parameters) and so cannot have type arguments.
I have the below code (which goes through the C: drive and gets file info data) and want to convert the length to a "respectable" number - i.e MB. The problem is that the line below does not do anything to the code.
Line is: strlength = strlength * (1024 / 1024)
Private Sub btnclick_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnclick.Click
Dim strFilesinfo As System.IO.FileInfo
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Currently i have this code:
If InStr(1, UCase(TextBox3.Text), TextBox2.Text) <> 0 Then
End If
which sees if text from textbox2 is in textbox3, but if there are multiple lines in textbox3 then it wont search.
how to make a multi language desktop application in vb.net 2005. only a small desktop application in which i can change language according to countries.
View 1 RepliesI am developing a VB.Net application. That application might be working on a LAN. MS Access as a backend will be used.
I have developed many single user applications, but don't know of multi user , LAN, manage DB etc. How do I make the program as Multi user on LAN. Data will be accessed at the same time. How to mange such things.
In vb.net, it is possible to design a function which can operate on generic parameters which meet multiple constraints. For example, it is possible to have a function accept as a parameter a class which inherits from Control and implements IList. This function could use "Control" or "IList" methods on such an object, and also pass the object to anything that expected a Control or an IList [note that this particular combination was chosen to facilitate a brief example, not to be a particularly useful combination].
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This approach provides compile-time type-safety; there's no need for a cast that could fail at runtime. An alternative approach would be to pass the argument as either a Control or an IList, and have the function cast to the other. That would, however, fail at runtime if the object that was passed didn't in fact meet both constraints.
Under what circumstances is it good to use a generic function like the above, in what cases would it be better to have objects which are going to meet both constraints have a new interface like IListableControl(Of T) which would include a TheControl property that would return itself (cast as a control), and in what cases would it be better to have a generic ISelf(of T) interface, any implementor of which would be expected to provide a "Self" property that would return itself as a T?
Using multi-constrained generics, it's possible to do a lot of things without requiring any run-time typecasts, but I don't know what the performance costs are likely to be. I tried writing a short program to generate 65,536 different generic types at run-time, e.g. Foo(of Bar(Of Foo(Of Foo(Of Bar(Of Foo(...(Of Blah)) and it got pretty slow, so I can tell that the time required to handle generics isn't fixed, but I don't know what factors affect it.
Okay, I've looked but I can't work out arrays for textboxes and labels. So, using 2 textboxes, how do I do the following in VB.Net?
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I do not know why this does not work. Obviously, I made a mistake somewhere.
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i m trying to run a query on an MSAccess table, but it does not give me any count but only 0.
There are 3 null values which i should be getting but it does not give me the result. This query works perfectly in MSSql Server 2008.
the query is :
Quote:
SELECT COUNT(*) AS Cntr
FROM (Modul m LEFT OUTER JOIN
Relation r ON m.Mod_Name = r.von)
WHERE (m.[group] = '')
I need a workaround for this but am unable to find one.
I am creating a form application that should display information from one dataset into individual textboxes (ie. system name, system id, location name, location id). The textboxes populate upon the selection of a pair of cascading combo boxes. So, the user first selects a system name from the first combobox, then that selection will populate the second combo box for the locations of that system. (This means that each system may have more than one location.) Once the location is selected, each of the 4 textbox should populate with the corresponding data but I'm not quite sure how to write the code..
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can you write me code of data storage?for example: I want to saved the data through textboxes when the program does not work.
View 2 RepliesI have this code below that I called a Conversion Wizard Because it converts temperature, weight and currency. It works so far but I am stuck. I don't know how to apply the correct loops to it. For example, Do While and Do Until. I want it to be able to work out a conversion then loop back to the Menu-options. So that you can do as many conversions as you like and end when option 4 is selected.
Option Explicit On
Module ConversionWizard
Sub Main()
Dim userOption As Integer
Dim farenHeight As Integer
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I am new to asp.net and have been working through the tutorial - up to lesson 10, however I cannot get the partial view to work.
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I have a VB2002 program that works. When I run it in VB2008, it updates, and runs and debugs until I shut down. When I try to start it up again from the updated SLN, or try to run the .exe in the BIN folder, I get the message "This application has failed to start because the application configuration is incorrect.
I checked the error logs and it says there is a syntax error in the first line of the vhost.manifest file in the BIN folder. The first line is the xml declaration and it includes the parameter standalone = "yes".
When I put the error message into Google I only get references to Visual C++ compiled programs running on machines without the C++ redistributable dll. That doesn't seem to apply here at all, since I have the VB 2008 express edition installed on this
I m trying to filter a sql db with many filter criteria which inert the user in textboxes .. i ve tryed this query
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i want to process a list of strings using multiple threads. the first function pases it, it then send the result to another, and finally that one displays the final result in list view
dim items as new list(of string)
private sub button_click()
start parsing thread
threadParse = New Thread(New ThreadStart(AddressOf startprocess))
threadParse.Start()
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Suppose I am going to the vb6 projects to vb.net, I have many references in vb6.My question is may I add the references directly to the vb.net projects after I modified the codes?
View 3 RepliesI am lost in translating this vba code to vb.net
Dim hFile As Long
Dim bytInfo(40) As Byte
hFile = VBA.FreeFile[code]....
How would you convert this line of VB6 code to VB.NET 2005
HTML
sblock = StrConv(System.Text.UnicodeEncoding.Unicode.GetString(byteArr), vbUnicode)
I guess... I've tried forever, and not only does it seem to produce improper HTML, it doesn't work. I've tried everything. I need to convert text in a RichTextBox to HTML.
View 3 RepliesTable contains 2 columns Tags10 and TU. Its values are:
NDX___________TUI48
JJI_________ NULL
CmdSelect.CommandText = "Select * From Tags Where Tags10='" & s_temp02 & "'" 'OK
ReaderSelect= CmdSelect.ExecuteReader() 'OK
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How to check this? If NULL there is nothing to do, if not NULL, we should put the value into s_temp03.
how to create a multi-user chatroom program. I don't have the server, but I have got a web hosting. I want to know how I can connect to the chatrooms by connect to my web hosting using with httprequest?And also, I would like to have code to allowed me to send the users private messages, ignore the users and kick/ban the users out of the chatroom.
View 10 RepliesI want to know what the Event has raised in a multi handler.
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I'm currently trying to make a vocabulary/flash-card program so I want an array that can store multiple values per item. That way I can shuffle the "cards" (array items) while keeping the word, definition, and part of speech on the same "card". So if I where to access the array I would want to be able to do something like this:
Dim vocabList as VocabArray
vocabList(0).Word = "blah"
vocabList(0).Definition = "blah"
vocabList(1).Definition = "blah"
And then if I where to re-arrange them the properties would remain together but just in a different spot of the array.I can get really close to this using an Item Structure and declaring the variable name with () but the problem is I have to include a number with () and I need to be able to add infinite values to the array, I can't have a set number.Also I would prefer to make it like an ArrayList as it has .Add, .RemoveAt, .Insert etc. In normal Arrays there's no easy way to add, you have to resize and stuff.
Anyways here's close to what I want, but I can't have a set amount and I'd prefer the ArrayList structure so I can just have like Array.Add and then have a Item added onto the end with 3 variables on it. The only thing is that with .Add you usually put something in paranthesis after it to denote the value to add, but if I have 3 possible values then I would have to have parameters for it or something, like .Add(Word, Definition).
Structure SpecialArrayList
Public Property1 as String
Public Property2 as String
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