Verify If A Value Exists Within A Column In A Table?
Jan 20, 2010I'm trying to do an if statement to determine whether a value entered in a text box exists within a column..
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How To Verify If Value Actually Exists
Feb 10, 2011I've created a little procedure that I use to verify if a value does actually exist. I'm currently using this all throughout my application for things such as verifying if a control's EditValue actually has a value. I was wondering if I have missed any scenarios where a value would not be available, missing, non-existent, blank, etc., and how would I incorporate in my procedure.
Public Function ValueExist(ByRef CheckValue As Object) As Boolean
Try
ValueExist = True
If IsDBNull(CheckValue) Then
ValueExist = False
[Code] .....
How To Call On A String Located In A Dll And Verify That It Exists
Jan 23, 2011I am making a program that Calls on a string in a dll to verify that the program is registered. Any idea on what functions I need and how to write a string in a dll?
View 1 RepliesVS 2008 Verify That Email Address Actually Exists?
May 13, 2010I would like to know if there is any way that you can verify that a email address actually exists like using this tool: [URL]. would like to wirte an application that does this in visual basics.
View 6 RepliesError - Verify That The File Exists In Specyfic Folder
Apr 30, 2010git this login form, streamreader looks for a matching user name and password and everything seem to be ok until i run it. I'm getting this ERROR: "veryfy that the file exists in specyfic location" this is code:
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
Go Through The Column Headers And Look For Specific Text To Locate And Verify?
Aug 24, 2011I need to go through the column headers and look for specific text to locate & verify which column contains the data I want.
View 5 RepliesVerify/check The Database Table That Only 20 Record Belong To This Groupname In Button?
Jan 5, 2012i am using vb, i have a aspx page which contain a textbox (txtStudentName) and a drop box (dropdownlistGroupName) and a save button
student table
StudentID StudentName GroupID
1 ABC 1
[code]....
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 RepliesNo Data Exists For Row Or Column?
Sep 3, 2010Why 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.
No Data Exists For The Row/column
Nov 4, 2009I 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].......................
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 RepliesDB/Reporting :: Datatable Column Already Exists?
Oct 15, 2008I 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
[Code]...
Determine If Datarow Column Exists?
Nov 14, 2008I 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?
Search A Datagridview Column To See If A Value Exists First?
Jan 22, 2010I 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].....
Test If A String Exists In A Column In A DataTable?
Sep 15, 2011I have two tables, dt & dtResults.dt contains 3 columns named: vchInstrumentAnalyteID, bintAnalyteCodeID, & vchAnalyteCode dtResults contains several columns including the columns in dt
I want to get vchInstrumentAnalyteID from the first row in dt and test if it exists in the vchInstrumentAnalyteID column in dtResults. If it exists, I want to use that value from dt to filter rows in dtResults and fill all the filtered rows with data from that row in dt. Then loop to the next row in dt.
I have this code, which is close to what I need, but I can't get it working.
' put analyte data in results table
For Each drA As DataRow In dt.Rows
If
[Code]....
Can't Find Table Even Though It Exists
May 10, 2009I'm using the following code (System.Data.SQLite within VB.net)[code]...
I know the table exists because I can write to it via the command line through sqlite and through Autoit and can see it and edit it in the SQLite browser when I open the database. I don't understand why VB can't see it (I know it sees and opens the database file just fine).
Table / View Does Not Exists
Sep 4, 2009I developed a package in vb6.0 backend as oracle 8.1.7, i instaled my package on nearly 50 client systems, every thing is fine except ,in some screens when iam saving the record it displays the message "Table or view does not exists", but this error is occuring only on thoes systems using other than Windows 2000 OS . What might be the problem
View 5 RepliesADO.Net Excel, Checking If A Table Exists?
May 14, 2009I'm using ADO.Net to work with an Excel Document. Essentially, I'm looking up values in a table called "source" and creating a new table called "result" which will be populated with the results of my query.
I have a couple of questions.A) How can I check if a table exists and create a new one if it doesn't? B) Is a table the same as a sheet in Excel?[URL]...
Check If Record Exists In A Table?
May 23, 2012I have a tenant details form that has a field called TenantID, I also have a Lease table that also has a TenantID field, what I want to do is click the lease button, check to see if the lease already exists, if it does open the lease form to that record. If not then open the lease form to a New record so the user can enter all the information for that lease.
I am trying to use the below code but am having a little trouble understanding how it all works. What needs to be declared, what doesnt
HTML
Private Sub btnLease_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLease.Click
Dim fm2 As New LeaseDetails
[Code].....
Using VB Import Multiple CSVs To Access Table, Verify, Remove CSVs From Folder?
Apr 9, 2010i have a series of CSV files that are posted to a specific web folder that I can specify in network places. Each file has same structure, lots of fields, and have consistent name schema "prefix-mm-dd-yyyy.csv". i need to use VB to process all these files, either individually or by consolidating into one file and appending to an existing table. i also need to somehow add a "download date" field to the process so i can show when the file(s) were appended. then i need to verify that it worked ok so i can then, still within VB, move the files out of the folder, such only the CSV files that have yet to be imported/appended are in the folder (so I don't have to guess about which files I have already uploaded and processed.i can figure out how to make a DO UNTIL loop, but i can't get the import statement right... nor can i figure out how to verify that the import happened in order to move (or remove) the source files.
View 1 RepliesCheck If An Entry From A Textbox Exists Within A Table?
Jun 5, 2010I am looking to programme a button to check if an entry from a textbox exists within a table.
This will done via a button.
how I would code the button to make it query the table?
Check Whether A Value Exists In A Table; Show MessageBox
Oct 22, 2011I have an 'invoices' table with a column for the invoice number.
When adding a new invoice, I would like to check if it already exists. If it exists, produce a MessageBox to the user that there's already a record with this number.
I'm using Visual Basic 2010 and SQL Server 2008.
Search An Access Database Table To See If A Value Exists?
Feb 9, 2012i am trying to search a table in an access database to see if the value of a text box exists in it. I have this so far:
Dim myConnection As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & Application.LocalUserAppDataPath & "\Database" & "\Student Aid Database.mdb")
myConnection.Open()
[code].....
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
Multiple Rows In Add Row - Error Says That The Row Allready Exists In The Table
Jun 22, 2010Have a method who gets data from one table, put the data into variables before it it returned into the same table with changed ID etc. My problem is that it adds the first row without any problems, but when it is supposed to add row number 2 the error says tha the row allready exists in the table. and I can not understand why. I have put in a couple of messageboxes to se that the ID is changing and that the ordreID is correct and changing as they should and they do, but stll I get that errormessage.
My code looks like this:
Public Sub Ordreupdate()
Dim dtbl As New DataTable
Dim dt As New DataTable
dtbl = Kalkyle1DataSet.Tables("Ordre")
dt = dtbl.Clone
[CODE]...
Annyone who can see why I get that error?
Dynamicly Displayed DropDownList If Multiple Entry Exists In Table?
Apr 9, 2012I'm trying to create an option to select a specific entry in a SQL table if multiples exists. The Sub listed below is for a textbox (MOTxt) and a button (GotMO) for checking an MO# to pull from SQL. Based on the number entered, will populate other text boxes on the page with that row's data. There are exceptions to this, where the MONumber will be entered more than once with different data associated with each entry. So, here's my situation. If we have a duplicate MONumber listed in the table, it will populate the textboxes with the first entry it finds for an update.I would like to create a dynamic dropdownlist (that displays only if multiples are found) displaying the 'Name' field entries for each MONumber found, then once the correct name is selected from that list, to then populate the textboxes with that selected datarow.Here's my code behind:
Protected Sub GotMONum_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles GotMO.Click
Dim da As New SqlDataAdapter
[code].....
Replace Column By A Related Column From Another Table In DataGridView
Dec 14, 2011I have:
- Table1 with columns: PK_ID1, LOCATION, DIRECTOR, SELLER, SELLERID, WORKTIME (relationship), WORKCODE
- Table2 with columns: PK_ID2, WORKCODE (relationship) & WORK_DESCRIPTION
My DataGridView do a SELECT * FROM Table1;How can I replace WORKCODE with WORK_DESCRIPTION in DataGridView, please?
Forms :: Error "system.argumentException; Column 'test_id2' Does Not Belong To Table Table
Mar 24, 2009I am getting the error "system.argumentException; Column ' test_id2' does not belong to table Table. At System.Data.GetDataColumn( string columnname0 at system.data.datarow.get_item(string columnName).
This error is occuring right after I set the parametervalues in the report object of the Crystal report.(Note this a visual basic.net 2005 windows form application.)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cryRpt As New ReportDocument
Dim sql As String
[code]....
The value for the first parameter @Parm_1d1 value to the crystal report version 11 is correct. However, when trying to access the second @Parm_1d2 parameter ,the values past to the crystal report is not correct.
Check If LINQ Entity Of Unknown Type Exists In Its Respective Table
Sep 23, 2010I'm trying to check if a LINQ Entity exists in its table, but at design time I dont know what type that entity is. So I figure I'll just get the table, and try the Contains method on it. But I cant get the table in such a way that I can query it at design time.I've tried the GetTable method on the datacontext, but I dont know how to cast it to the appropriate type when using GetTable(Of). GetTable(Type) works, I just use Entity.GetType(), but then I don't know how to query the ITable thats returned.To try and cast the ITable to something useable, I created an interface(IWhatever) that could implement properties that are native to all of my entities I would encounter. [code]
View 2 RepliesConvert A Two-table Exists Query From SQL To Linq Using Dynamic Fields In The Subquery?
Jun 7, 2011I'm trying to query old Access database tables and compare them with SQL Server tables.They often don't have primary keys, or they have extra fields that had some purpose in the nineties, etc., or the new tables have new fields, etc.I need to find records - based on a set of fields specified at runtime - that are in one table but not another.So, I do this kind of query all the time in SQL, when I'm comparing data in different tables:
dim fields_i_care_about as string = "field1, field2, field3"
'This kind of thing gets set by a caller, can be any number of fields, depends on the
'table
dim s as string= ""
[code]....
It tells me it can't convert a Boolean - Is there any way to do this without Linq expressions? They seem far more complex than what I'm trying to do here, and they take a lot of code, and also I can't seem to find examples of Expressions where we're comparing two fields in a subquery.Is there a simpler way? I know I could do the usual EXISTS query using JOIN or IN - in this case I don't need the query to be super fast or anything. And I don't need to use a DataTable or DataSet - I can put the data in some other kind of object.
