I 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 RepliesI have a function in VS2008 VB.NET that creates a dataset and reads field values from that were loaded from a SQL Server 2008 database tables. The tables are from varied sources and in some cases particular column/field names are different. Some use a long name; others use a short name. I need to determine whether a short name or a long name is being used.Pseudo code:If row("ShortName") Exists then ReadDataFrom r("ShortName").ToStringElse ReadDataFrom r("LongName").ToStringEnd If
How would I determine if a particular column name exist in a dataset or datarow?
I 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 RepliesUsing VS2005, VB.Net, Dot Net 2.0, SQL Server 2000. If have some Columns (varchar and numbers) in a DataRow that I want to set to DBNull in the database. The fields as defined as Nullable in SQL DB table.
I have some fields that are populated when loaded but I want to update to be null using the ADO.Net data objects. If I try and use Row("FieldName") = DBNull.Value a 0 gets written to number fields (not sure what gets written to varchar fields.) What code should be used to update fields to Null using ADO.Net dataobjects?
[Code]...
I've been looking around online, and havent quite found what im looking for.I have an unbound DataGridView on my form that has 1 columns ID and NAME, i did a loop to fill in all the ID columns. Then when i loop trough all the ID's, i want to update the NAME column with some data.
View 3 RepliesI need to display a column called Full Name in the my datagridview, but the datasource (datatable) does not have a FullName column. It only has FirstName and LastName columns. I'm setting up my DataGridView like this:
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I 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]...
This 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.
Why am I getting this error, I know there is data there, the code I am using is:
Dim iMaxFields As Integer = oDataReader.FieldCount - 1
Do
sLine = ""
For iColCounter = 0 To iMaxFields
sColOutput = oDataReader.Item([iColCounter]).ToString()
sLine = sLine & sColOutput
[Code] .....
Basically I just want these details put into a HTML table.
I am doin a library management project for my college using vb.net and Ms Access as database. I am getting a error No data exists for the row/column. wen i try to select a value in 1st combobox . The first 3 values are working perfectly wen i click on 4th i get error heres da code
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
[CODE].......................
In 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?
I 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"
I 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 RepliesI 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?
How 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 RepliesI 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]....
I 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 RepliesI 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 RepliesI'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..."
I 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 RepliesHave 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 RepliesI 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 RepliesI 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.
I 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].....
VB 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] .....
I have a datagridview which is populated from a datatable. This works fine. But if i run it more then once i get a column name "example" already belongs to this datatable. Ive tried everything to clear all the columns of the datatable and the gridview but still the same
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I am creating a program which searches saved .htm files for the source codes. I get the source code and do manipulation on the code to pull the values I need into a datagridview.
Is there anyway to search a datagridview column to see if a value exists first, so no duplicate rows of data will be added? I was thinking of making access table and linking the datagridview to it, but i'm not sure how to set the database links up with code (other than the gui), and then still search the column so I don't put in duplicate rows.So far, I have only come up with the way to add the data row by row...
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim IMsku As String
Dim IMskuitna As String
[code].....
I'm trying to do an if statement to determine whether a value entered in a text box exists within a column..
View 6 RepliesI 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?
What 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 Replies