How To Check If Primary Key Exists In Access DB
Feb 21, 2011I want to check in an Access Database if a primary key exists using VB.Net & OleDb:
By primary key name
By number of fields as primary keys
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Check If A Table Exists In Access File, If Not Create It?
Jan 16, 2008I wont to be able to check if a table exist, if not i wont to create it...
This is the code i use for connecting...
Code Block
VS 2010 Check If Primary Key Is Already In Use?
Sep 12, 2010Here is my problem:
For example, I have 4 existing records
UserNo - UserName - Password
1 - ABC - 1234
[code].....
Check If A Xml Tag Exists?
Sep 25, 2010I was wondering if anyone could show me how to check if a tag exists?Here is the code that I am using to get the information from the xml.
Dim XmlFile As New XDocument
XmlFile = XDocument.Load(WorkingDirectory & "ToolsMediaInfoMediaInfo.xml")
Dim Manage = XmlFile...<track>
For Each XmlTag In Manage
If XmlTag.FirstAttribute.Value = "General" Then
[Code]...
Check If URL Exists?
Jul 10, 2009This is the standard way of checking if URL exists [code]....
return true; } catch (Exception ex) { return false; } But my problem is that we have to check it for around 100 URL's. It takes more then 2 minutes to check for all as it is trying to get response of all of them. Is there any way that we can check if URL exists without getting complete Response so that total response time is less.
Asp.net - Check If Referrer Exists?
Jul 25, 2011In my code, I want to check if a referrer url exists and if the referrer url contains a specific sub string. I know how to check for the sub string:
If( InStr( Request.UrlReferrer.ToString(), "some sub string here" ) > 0 ) Then
But I don't know how to check if a referrer exists or not. No refer exists if the url is entered in manually in the address bar. So I tried this, but this does not work:
If (Not (Request.UrlReferrer.ToString() = "")) And (InStr(Request.UrlReferrer.ToString(), "some sub string here") > 0) Then
how do check if a referrer exists?
Check If A Column Exists In ADO.net
Sep 13, 2009I have a windows service which fetches data from various datasources and build a XML file and send it to a webservice. For example first I will get customer details from Oracle Database and build the XML file and then the SQL Server database and build the customer details XML. I am planning to use the same function below to build the customer object irrespective of what the datasource is. But dr("age") column is not available in SQLserver datbase How can I check if a column exists or not.[code]
View 3 RepliesCheck If A Folder Exists?
Sep 30, 2009I am trying to check if a folder exist, it doesn't work if the folder name has a space or "_" or "-". .
here is an example of cases that don't work:
"Folder test"
"Folder_test""
"Folder-test"
Check If FTP Directory Exists?
Jan 29, 2010I know how to make a new directory on an FTP server, but I wanted to know how I can check if a direcogtry exists, and if it exists display a message?
View 2 RepliesCheck If Permission Set Exists?
Mar 17, 2010I am using Caspol.exe to install a custom Permission set and add Code Groups for my .Net 2.0 Windows Application.
I have created a Console Application that uses caspol.exe to add Permission Set and Code Groups. I first install the Permission Set and if I do not get an error, I continue to install the Code Groups
Now sometimes I need to add a new Code Group to the client machine, so I make the changes to the console app and it is executed on the client machine. If the client machine already has the Permission Set installed, it returns an error and stops the further processing.
So, I want to know if I can check whether a custom Permission Set is already added or not?
Check If Process (URL) Exists
Aug 4, 2011How would i just if a website exists, and, if so, launch a browser to open it. I am making a little tool for one of my freinds and it allow then to quickly launch websites. How would I check if that is a valid website to launch, so i don't get an error if it is not valid.[code]The error i want to stop is "Cannot start process because a file name has not been provided."So basically i want to make sure that the program can launch the URL so i don't get this error
View 3 RepliesCheck If Regestrykey Exists?
Nov 17, 2011I cant get the following code to check if my regestrykey exists can some one help. the idea is to check if it exists if so do nothing if not create it, along with its value...
the full key is HKEY_LOCAL_MACHINESOFTWAREVTSAdvanced Offset 2AdminAccess
> If Dir$("HKEY_LOCAL_MACHINESOFTWAREVTSAdvanced Offset 2Admin", vbDirectory) <> "" Then
[Code]....
Check If Registry Key Exists?
Feb 23, 2010I need to figure out if a registy key exists under the HKCU hive. If the key exists do this, if not then this.
View 6 RepliesCheck If SQL Record Exists
Jul 19, 2011I have a small database. 2 main tables called CaseDetails and Checks.Each record in CaseDetails can have 3 checks recorded against it in the Checks table. But can only have one check of each type (check types 1, 2, 3).I have 3 linkbuttons which will take the user to the input form for each 'check'. If a 'check' already exists i want to hide the linkbutton that takes the user to that 'check type' input form (the 3 input forms have different fields).So what i need to do, is connect to the SQL database and see if a record exists for each 'check type' and hide the linkbutton to prevent users from entering another record with the same 'check type'?I have tried reading the reults into an array and examining that array, but havent been able to do so.
View 5 RepliesCheck If Username Exists?
Nov 15, 2011I'm doing an application to manage a school of music, at the moment i'm working on registration (with MySQL DB).
Imports MySql.Data.MySqlClient
Public Class Admin_Reg
Dim server As String = "Server=localhost;Database=escola_musica;Uid=root;Pwd=;"
[Code].....
Now i want to verefy the table if the username exists or not. If it exists msgbox "Registration Complete", if not "Username already exists. Choose another one..."
Check To See If Registry Key Exists
Sep 15, 2006I am trying to figure out how to check if a registry key exists. If it does, do nothing, if it doesn't, recreate it.I've found numerous resources on the subject, and have made progress, but one little thing is stoping me.[code]The problem is that this reports "Not Found", even though the key 'regkey' exists in the registry. Also, if I remove 'regkey' from the code, it reports "Found". So it does find the subdirectory in the registry.My question is, how do I check to see if the 'regkey' exists? I'm running Windows XP Pro SP2.
View 19 RepliesHow To Check If A File Exists
Feb 2, 2011Have only just started trying Visual Basic after using Delphi almost ever since it first came out. How on earth do I see if a file exists? - simple terms please
View 2 RepliesHow To Check If Already Exists In Folder
Dec 2, 2011I am trying to copy some files to folder.I am using the following statement to check if the source fie exists If My.Computer.FileSystem.FileExists (fileToCopy) Then But I donot know how to check if file exists in the folder before copying.
View 1 RepliesHow To Check If Battery Exists
Feb 10, 2012I come back to the MSDN to ask another question now. That is:
How do you check if a battery exists in a computer?
I have the code here to figure out battery percentage.[URl]..But if a battery is not inserted it will show battery 100% and charging instead of it showing that a battery does not exist.
SQL Check If Exists Before Update?
Jun 5, 2011I would like to see an example how to check if pappssn exsist in database before the update is complete. If so to raise an error record exsist. My front end is VB however i would like to handle this within SQL in my stored procedure if possible.
ALTER Procedure [dbo].[usp_insertmemapp](
@pappfname nvarchar(50),
@pappmname nvarchar(50),
[Code].....
Subroutine To Check If Certain URL Exists Or Not?
Jul 1, 2009VB 2008 Express. I am trying to code a subroutine that checks if a certain URL exists or not. When I start debugging the application, and I press 'btnGo', if the URL in the textbox 'tstbURL' exists, it works fine, but if it is invalid, a first chance exception of type 'System.UriFormatException' occurrs in System.dll.
Here is my code:
Private Sub tsbGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tsbGo.Click
If tstbUrl.Text = "" Then
Return
[Code] .....
Check If An Infinity (or NaN) Number Does Exists?
May 22, 2009I am using vb express edition 2008. I need to check if an infinity (or NaN) number does exists but I don't know what my mistake is.
Dim Slop1 As Double
Slop1 = (20 - 10) / 0
If Double.IsNaN(Slop1) Then
MsgBox("Check the Coordinates")
End If
whats the diference between the 'IsNaN' and 'IsInfinity' is?
Check If .dll File Exists And Load It
Nov 28, 2011What is the easiest want to check if a .dll file exists, then to load it ? ( i don't need to use modules from that dll file, i just want to run it ).
View 1 RepliesCheck If A Certain Value Exists In An Sql Server Database?
Nov 17, 2009I have a database created and tables inserted into it. One of the tables is called UserLogin. It consists of two columns, BarcodeId and Technician. I have a barcode value, and what I am trying to do is check if any of the values in the BarcodeId column of this table is equal to the barcode that I have. Then when I get a match, I want to get the Technician that matches that BarcodeId and display the Technician in a text box.
I was using this code sample:
Private Sub HasRows(ByVal connection As SqlCeConnection)
Using connection
Dim command As SqlCeCommand = New SqlCeCommand( _
[Code]....
I'm not sure if I am on the rught track or not, when the code gets to the line connection.Open during debugging, nothing seems to happen.
Check If A Column With A Given Name Exists In A Datarow?
Dec 31, 2009I want to insert a value from loop in datarow so before entering value in datarow, i want to check that a perticular column NAME exist in table or not...please tell me how can i check it. (vb.net preferred).
View 2 RepliesCheck If A Drive Exists Using 2010?
Oct 19, 2011How can we check if a Drive exists in the system
View 4 RepliesCheck If A Folder Exists On A FTP Server?
Apr 3, 2011I have literally looked everywhere on the internet and i cannot find a way to check if a folder exists on an FTP server. I am using Visual Basic 2010 Express Edition.
View 7 RepliesCheck If Any File Exists In A Folder?
Dec 8, 2011How do I check if any file exists in a folder.
If found I want to delete it.
I can check for a specific file:
If System.IO.File.Exists("C:Labs" & "Lab0.txt") = True Then
msgbox "Files Found"
else-------------> I want to Delete it End If
Check If Directory Exists Error?
Apr 30, 2009text boxes. (Where Combo box1 is the Drive Letter, Combo Box2 is a folder, And Text box is another folder. ie.
If My.Computer.FileSystem.DirectoryExists("ComboBox1.Text & " " & ComboBox2.Text & " " & Textbox1.Text") Then
MsgBox("File found.")
[code]......
Check If Directory Exists On Network?
Jun 5, 2012I can't seem to work this out... I've got a program that references a network path. The problem is that the network files are not found when I run the program from various computers. If I have the user navigate to the network path directoy and then run the program it works perfectly.
The problem is that whenever the machine is restarted I run into the same problem and have to manually navigate to that path before the program will be able to find the files.
I then tried several checks to see if the directory exists but it's not working.
Public Sub FillListBox()
If My.Computer.FileSystem.DirectoryExists("\AB eamportalShared%20DocumentsJustin%27s%20AppsFeedback") Then
[Code]....