.NET Referencing Previous Datarow And Appending String?
Apr 30, 2012
I have a project that I am creating a string based on a hierarchy. Without going too much into the logic, I am sure the IF THEN logic works.I have a master control table that contains a 4 number hierarchy sequence for each row. I need to loop through the control table to know how the string should look, and start a new string if the F_ID are different. I am using a For loop to index the control table and loop through it building the string as I go, based on the sequence. I am just concerned if I am referencing the previous datarow value with the .Item Overload option in the IF THEN statements correctly, and appending the stringbuilder variable using the composite primary keys properly.
I have been out of the VB game for awhile and am now trying to catch up to VB.NET. I know my current solution probably has a more efficient way of doing what I want, such as using LINQ or something. But, I am start at the bottom and working my way up. I essence I have 1 table controlling which columns get added to a working string, that I will eventually export into a text file. My first table has 3 columns(ID, String, Processed). The ID is the index or primary key and the string is the data I need, and Processed tells me if I have extracted that string yet or not( 0 for no and 1 for yes)...
My main problem is checking values in table 1 where I need to add the string. Of course my problem might be deeper in how I am even returning the values from the datatables.
Code:
Partial Public Class StoredProcedures <Microsoft.SqlServer.Server.SqlProcedure()> _ Public Shared Sub StoredProcedure1()
I have a combobox that pulls a list of values from a database. When a new entry is entered I want an entry in the combobox to read "New record". However, from what I have seen I can only insert and object, such as a DataRow, into the combobox. Is there anyway I can convert a string to to a DataRow, or some other object and insert it in to the combobox? I know there is I am just rusty on my vb.
MyProperty is just a property defined in another class. However when I try to reference that property as shown below I get an 'Identifier expected' error
I've been at this for an hour, but I can't seem to format a string as a percent while I am looping through a datatable. The string value that is being passed in is "3.22" Public Function securityDt() As DataTable Dim secMasterDt As New clsDataSecurity Dim dt As New DataTable dt = secMasterDt.getSecurityMasters() For Each row As DataRow In dt.Rows [Code] .....
I am looping through the rows of a DataRowCollection and assigning the fields of each row to a variable. I always get "Input string was not in a correct format" no matter how I cast this. I just need gapCd to contain 0 if the field is null or the value otherwise. It seems the IsDbNull is not returning true properly. I've also tried DbNull.Value comparisons with no l
I have several sets of similar objects (labels, progress bars) on a form in Visual Basic 2010 on Windows. In my code, I have collections that contain data, which needs to be pushed into the value/text property of each.
I would like to get a solution similar to PHP in that I can assign values somewhat like:
For ID as Integer from 0 to count(collectionExample) lblExample{ID}.Text=collectionExample(variableID)
...and as such to loop through so each of the different lblExample's were updated to their corresponding value.
The issue I have come to is that I cannot seem to reference an object on the form using a variable. I have also tried using something like
CallByName("lblExample" + variableID, "Text", CallType.Set, exampleCollection(variableID))... however I still can't combine the string and variable to reference the object.
Any solutions on referring to objects in VB2010 by combining a string prefix and a variable string identifier, similar to PHP's $variable{$variable} approach?
In VS2010 I'm encountering a PInvokeStackImbalance error when I call an unmanaged C function that takes a string argument. This only happens in VS2010 (works fine in earlier versions of vs). I know the MDA is more strict in VS2010 but I can't seem to figure out what the actual problem is.
I have two datatables with similar structures that I want to make one existing row to be updated from another datatable.
For example, "tableA" has three columns: "one", "two", and "three"; with "one" being the primary key...
and "tableB" has three columns as well: "one", "two", and "three"; with "one" being the primary key.
Say there is a row on tableA that is different than a row on tableB (with a matching primary key). What I wanted to do, as efficiently as possible, is to take the that row from tableB and replace the one on tableA so it'll be modified.
I'm not sure if there's an easier way of doing that instead of using loops for setting the row's items.
I'm trying to solve a problem regarding types of list. First of all I have a stored procedure in my DB which does a select of a single column and I try to proceed it in my app in VB. By making a method function I declared a DataTable that loads through the SqlCommand(with the CloseConnection behavior). After that I publicly declared a List(Of String) which needs to be populated with the rows/items from the stored procedure that is on the way. Below is my snippet of the code:
Dim dt As New DataTable() Try If conn.State = ConnectionState.Open Then
[Code]....
It's LPrefix = collection.Cast(Of String)() where I get an exception error telling me that I can't really convert it. The old fashion way is to iterate with for/for each loop but that's not what I want for best use of performance especially if the list will have thousands of rows from a single column. So basically, I want to insert those items from that DataTable to the List(Of String) without For/For Each loop.
Running on VisualStudio2010 Ultimate, .NET FrameWork 4.0.
i have the following code which appends a text base file knowen as a .pgp file; all works fine except that everytime i launch this app i append the text in one continual line i need the text to appned to a new line eveytime it is used.Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
I am trying to use and display calculations from various text fields, however it is appending the values. I think it has to do with it being a String Variable and not a Value.. here is the code
Private Sub btnTransact_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTransact.Click If rb1Deduct.Checked = True Then txtp1Amt.Text = (txtp1Amt.Text - txtTransact.Text)
This append feature does not seem to work. I've looked in many places to no avail. The other examples below for writing and reading seem to be going fine.
Private Sub ApFile(ByVal textFilePath As String) Dim objWriter As System.IO.StreamWriter = file.appendtext("textTBD") objWriter.WriteLine("textTBD")
I am trying to save the contents of a richtextbox to a text file. I know that they .SaveFile method automatically overwrites the existing file so I have a routine that will load the contents of the file into a temporary rich textbox control then append the new information to that and then save from the temp richtextbox. My application works as I want it to on my workstation but I cannot get it to work correctly on the notebook computer it will be running on from now on. It only works when I put in a breakpoint and I am not sure why?
[Code]...
If I put breakpoints on any of the lines rtb.Select, rtb.Copy, rtb.Paste then it works. I even tried putting a Thread.sleep before saving, thinking that more was needed to do the copy/paste but that didnt work either.
Lets assume I have a DataSet that contains the following info (columns seperated with | character):
1 | Logan | Young 2 | John | Doe 3 | Jane | Doe 4 | Joe | Soap
If I now write this info to a text file, but later want to append 5 | Susan | Sarandonto the end of the text file, I obviously want to check that the text file doesn't already contain the data that I want to append to it. I'm having a little difficulty figuring out how to perform this check...I know you'd have to loop through every row in the DataSet's table and compare it to every line in the text file. That part's easy.
vb program to append two pdf files together into one? I have invoices that are created as pdf files and I need to append a special announcement also a pdf to the end of it so I can upload one file to the internet for customers to download and view.
I need to read an XML document, and then add nodes to it. In the example below I have a grandparent, and parent node. I then want to add sibling nodes to the document dynamically. I don't know what I am doing wrong. But at line 17 I get this error message: Error: This document already has a 'DocumentElement' node. [Code]
We are trying to Open a text file and if our needed information isn't in there, we need to write it, otherwise we need to append to the existing text. We had it working in VB6 (below) and i havent the slightest clue
CommonDialog1.Filter = "Text Files (*.txt)|*.txt" CommonDialog1.FileName = frmSplash.fp & "\job_info\" & nam Open (CommonDialog1.FileName) For Append As #1
One of my projects i'm working on takes data from a server and places the results into a DGV, problem is the data is some 10 pages long in blocks of 50, i have tried to do DataGridView1.DataSource += query.tolist but i get an error.I have also tried creating a string and trying to add the query results to it but again i get an error. The code i have is like this:-
[Code]...
I haven't yet tried, but would the data append to the dgv if i just called this again using query and removing the queryTotal variable? seem to think they behave like that from past tests?
I want to create a new bmp file with 200 x 500: Append the footer.bmp into the bottom of the new image - position (0, 300) Resize the product.bmp to 200 x 300 and position into (0, 0)How do I do this using VB.NET?
Dim oBitmap As New Bitmap(200, 500)Dim oGraphics As Graphics oGraphics = Graphics.FromImage(oBitmap)
My user can export a ".doc" file but when VB.NET writes to this file it uses "" and "," characters at the end of each sentence. I was wondering if there was a way of actually appending the exported file to remove these characters?
Im making my own process manager. but if you update it every second to keep it in real time it makes this horrible shudder (items being removed and updating) losing your selected item in the process.[code]how would i change that to only add the new items rather then restarting?
