i am new to VB.net. just want to check an id number in my textbox if its aldready existed in my database. this is my condition: if textbox1.text = ds.tables("employees").row(0).item("id") then msgbox("ID already exist") end if
View 9 RepliesWrite a function that returns the number of duplicates that exist in an array.
View 2 RepliesI try to find online any example for create an application autoupdate.
When I run my application it check in a webserver if exist new version,if exist the software run update.
namespace of "system.runtime.caching" does not exist but in object explorer and microsof exist.i use microsoft visual studio 2010 and .net framework 4.0.i also cant use this name space(System.IO.MemoryMappedFiles & System.Runtime.Caching.MemoryCache)
any body know what is the problem. i want my program after doing something (opening a file or any thing that can do something my program use more memory.)use memory like startup run.
Here's my code:
Option Infer Off
Option Explicit On
Option Strict On
Public Class Form1
Public Sub NewToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewToolStripMenuItem.Click
[Code]...
I have Requests for VB(2005) very very important for my selly project!i need a button that determine if file exist and if that file exist then show a messagebox!and if not show messagebox!.
View 2 RepliesI want a Code to check Database exist in SQL and Message Box Show Database Exist Yes/NO?
View 1 RepliesI am doing a bar cash register and I want to use a if statement to see if fosters button and number 1 on the number pad are both pressed then multiply constant by quantity number
View 1 RepliesUsing VB.Net and Sql Server I want to check the user Entry Value.The User is entering the code in the textbox, before saving to the table, i want to check whethere code is already exist in the table or not.
Tried Code
cmd = New SqlCommand("Select code from table where code = '" & textbox1.Text & "' ", Con)
dr = cmd.ExecuteReader()
While dr.Read()
End While
If value is exist, then message to the user "Already Exist" other wise save to the table.
[code]...
If the code exist in the table only it shows the description
I feel quite silly posting this as I know my way around C++ decently and am writing an application in VB however I am getting quite frustrated with this problem.
Dim FileNo As Integer
FileNo = FreeFile()
Dim FILE_NAME As String = "C: est.txt"
[Code].....
When executing the above code it says at the FileOpen operation that the document does not exist or the relative path may not be right... I have looked in many place over the internet and even used the same examples from the Microsoft website however I get the same error.
I want the oppisite of
If My.Computer.FileSystem.FileExists() Then
end if
I am starting out with xml and vb.net here, my xml looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<Steps>
<X cmd="Message">
<Message>Hello World</Message>
[code]....
it works if all the elements are found (< Message > and < Title >).. but if for example the element "< Title >" is not found I get an error by trying to get the innerText.Is there a way to ignore these errors, I just want to receive an empty value and not any errors.
I'm getting a suprising FileNotFoundException although i'm sure that the file exists.I simply wanted to add Logfiles(IO.FileInfo) as attachments to an email, therefore i tried to check the length of every file to detect if they must be added/zipped.This works fine if these files already exist. But if i've created them in this run, i get above exception when i try to check the length. It's oddly enough that i can write into these "not existing" files(actually FileInfo.Exists returns false) without a problem one line before.
Here is some code...
Creating one of the files in the constructor of a class named Log:
Me.LogFile = New IO.FileInfo(infoLogPath)
If Not LogFile.Exists() Then
'tried to use `Using` on the Stream but that doesn't change anything'
[code]....
Basically I just want to use
tile1.backcolor = colors.while (just an example)
however tile1 is only created WHEN the form loads, and it will not let me compile it becuase it's saying it doesn't exist
I want to check inside a dir if any folder exists. Every way I found is to check for a specific folder with name as string. I want something like
folderExists = My.Computer.FileSystem.DirectoryExists("C:TestDirectory*")
how do i verify a file like a image or html exist on the web?
View 6 Repliesi am having a problem in writing the code that checks whether a directory exists or not in FTP using vb.net..
View 3 RepliesI had it working at one point now it does not want to work. Im checking the registry for a subkey and I know it exists but vb is telling me it doesnt, which is driving me up the wall, this is what I got[code]...
View 1 RepliesMy tables are PURCHASE and SALES...In PURCHASE table, fields are CODE(primary key), PRICE, DATE, TOTAL, QTY...when I'm entering datas in form and when i click submit, the datas stored... but when i enter same DATA(CODE), it is showing error...i don't want to show the DEFAULT ERROR message...so, i want to search whether the CODE is already in database or not...i.e When i click SUBMIT button, 1st it has to search whether the CODE is already PRESENT in table or not. if it is not there, DATAS have to be stored. otherwise, it has to DISPLAY MESSAGE BOX.
View 4 RepliesI am trying to change over a program from VB 6.0 to VB 2008 and I am having trouble with the EOF statement. [code] Argument not specified for parameter 'FileNumber' of 'Public Function EOF(FileNumber As Integer) As Boolean'.I have a Dataset with a Table called Table1. How do I get VB 2008 to perform the "Do While Not Table1BindingSource.EOF statement?
View 1 RepliesI have two DBF tables called product and ullage. The user enters data from products table into ullage, by searching for product id and adds their count into the ullage table. This part is working. how can I display the products table with all the prod_ID, Desc and price with Counts from the ullage table but were there is no count in the ullage table these product will be displayed but with no count number.
The Tables....
Product table
Prod_ID | Desc |price
1 Food 5.99
[Code].....
I am just trying to learn Visual Basic in 2008. I need some help theory about dll and ocx files. I have seen videos tutorials, and in some of them they use some additional files. i.e. MSwinSck.dll, or DVD .dll ect. But lot of these files does not exist in my program, noone is telling about these files and where to install them or how to get them.
[Code]...
This code works. i insert 3 string and then check if the database already save this code.if the first string does not exist it works well.but when 1 string "already exist" or found in the DB, all of the next string say its already in db even though it haven't. what should i do?
For count = 0 To strArr.Length - 1
If strArr(count).Contains("=") Then
str1 = strArr(count)
coun = str1.IndexOf("=")
str1 = str1.Substring(0, coun)
[Code]...
i'm using mysql database, what codes for check if username is already exist this for creating username and password ..
View 2 RepliesI have a VB2008 with SQL2005 MDI application with multible forms, and Form1 has serveral Textboxes, and Textbox1 is binded with SQL database Table1 Column ID, what I want to do is when try to save data if ID xxx aready exist then it spit out a message (ID already exist.)
View 12 Replieshow to use Array.Exist. I want to check if a value already exist in the array or not. Below are my sample code.
[Code]...
Type argument inference failed for type parameter 'T' of 'Public Shared Function Exists(Of T)(array() As T, match As System.Predicate(Of T)) As Boolean'. Type argument inferred from the argument passed to parameter 'match' conflicts with the type argument inferred from the argument passed to parameter 'array'.
Does the Visual Studio .NET Help Integration Kit exist for VS 2008?Tim Alvord
View 3 RepliesI have several photos stored in ~/image/ They are a01.jpg, a02.jpa...a09.jpg and so on. (some images maybe not exist) Also I have several controls their id name are image1, image2, ...image9 I want to make such function. If for example a05.jpg exist in ~/image/ then image5.imageurl= ~/image/a05.jpg otherwise image5.visible=false I use the following code, but it is failed, how can i solve it:
[Code]....
I was writing a generic class to read RSS feed from various source and to consolidate in one collection of object in VB.net.
Basically the function - using LINQ to XML - is working properly, but I have a problem when the RSS feed I am trying to read does not contain one of the node (as you know, many of them are optional). I would the returned value to be an empty string or nothing, but instead I get a runtime error back. I searched the web for the same problem and I found this post [URL] that apparently explain a workaround, but it does not work with my code.
I am also surprised by the little resources I am finding about this issue, so I am now wondering if I am even putting the question in the right terms...
Following you can find the code:
Dim PostsEnum = From BlogPost In XMLSource.Descendants("item")
Order By DateTime.Parse(BlogPost.Element("pubDate").Value) Descending
Select New Post() With {
[Code].....