MDataGridView In Method Which Retrieves Data From The SQL Database?
Sep 2, 2009
I have a tabcontrol with a number of tab pages each of which contains a DataGridView control. I populate each DataGirdView form a local SQL Server. The method which does this works fine. The problem I'm having is I want to use the same method to populate each DataGridView control. I created a private member variable called mDataGridView as a DataGridView and use the TabControl SelectedTab property to determine which tab page the user has selected. I then try the following
[code]...
I then use mDataGridView in my method which retrieves data from the SQL database. Although the compiler dosn't gag at this it doesn't work. Am I right in thinking that mDataGridView references dgvQuoteTemplate?
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Feb 3, 2010
how to retrieve data from SQL Database using SQL Connection by selecting the individual value in a ComboBox which the data in the ComboxBox is also retrieved from the SQL Database using DataBound. A 'Display' Button will be clicked to display the data in a TextBox, based on which value the user had selected.
Below is my current
Private Sub displayBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles displayBtn.Click
'Create Connection
[Code]....
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Oct 15, 2011
I'm attempting to create a program where the login and password will be verified on an SQL database of user information. I keep getting the error "SQL Execution was unhandled" I marked the code that was causing the error in red. I'm using Visual Studio 8.
Public Class Form1
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
[Code].....
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Apr 5, 2012
Two questions:
1) I have a stored procedure that retrieves item information from a SQL Express database. Should I attempt to do the rounding the stored proc or client side in the app?
2) My rounding needs to be custom. I have a figure that goes down to the 4 place meaing x.0000 if the 3rd digit is 4 or more then I would round up to the nearest cent x.00 if it is 3 and below I would round down. I have looked at the math functions in vb.net and I dont see right out the gate how to accomplish this.
So my question is should rounding be done in SQL or client side and if it is client side do any of you have pointers on how to slice and dice this?
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Jun 4, 2009
I have a web page where I want users to enter ratings for a particular software. I have got this working fine. What I am after now, is that users need to be logged in to enter ratings. I have dragged the loginview control onto the page and dragged all the other controls/datasources into this view. However now I am getting alot of squiggly lines regarding my controls not being declared. I have been told that I need to use the FindControl method. However I'm not sure on how to use it in my instance as I have a dropdownlist involved.
The controls are called: LoginView1, DropDownList1, TextBox1 and Button1 for the insert.
Any proper declarations so I can insert data into my database. Here is the code as it stands outside of the loginview:
Sub doInsert(ByVal Source
As
Object,
ByVal E
As EventArgs)
Handles Button1.Click
[Code] .....
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Oct 20, 2009
I'd like to export a table from Access to a text file (or a spreadsheet) using VB code in Excel 02. I'm using the transfertext command but my code runs through without actually doing anything or throwing up any errors. If I swap the code round and change Export to Import and move the data into the text file manually then the code will happily import the table into Access.
Sub Export()
dbfile = "C:XLSMDBTable.mdb"
Dim a As Object
Set a = CreateObject("access.application")
[code]....
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Jul 9, 2010
I'm writing a program that retrieves certain lines from a textfile. This textfile is rather large, so is it possible to have a progressbar that shows the progress when it retrieves?
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Jul 9, 2010
I'm writing a program that retrieves certain lines from a textfile. This textfile is rather large, so is it possible to have a progressbar that shows the progress when it retrieves?
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Oct 15, 2011
I'm currently creating a system for medical record for our school project?i always get this error " Couldn't find 'C:/User/...' " i coudnt retrieve the filename of the picture so that i can store it in my database , BUT when I try my back up file it works .it save image in the Database It's the same code , i did not change anything here is a part my code..
Private Sub MDISaveToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripButton.Click
If Not didPreviouslyConnect Then
MsgBox("Connecting to database")
[code]....
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Jun 10, 2010
My apologies I have posted this in the wrong catagory It should be in VB.net, my mistake)Hi guys I posted this question at the end of another topic I started but I think it will be over looked as the origional topic was solved of the dreamincode community You must all be getting sick of my quexstions by now haha I suppose you don't learn if you dont ask.
Anyway I have used the delete sql method to delete data from a database, I want to refresh the data in the form after the record has been deleted. Do I have to close the form and then open an new instance of it? or is there another way I can refresh the data?
[Code]...
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Jul 30, 2011
GetProcAddress Function Retrieves the address of an exported function or variable from the specified dynamic-link library (DLL).Lets say I have something like this:
Dim moduleHandle As Integer = LoadLibrary("C:myDLL.dll")
Dim methodName As String = ""
GetProcAddress(moduleHandle, methodName)
DLL should be win32 standard dll or .net dll.
How can I run the exported function if I have the address of it through GetProcAddress().If someone could supply some code it would be great.
[Code]...
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Oct 19, 2011
I have written a store procedure which retrieves more than 7000 rows. While executing the store procedure in my VB.NET winforms application, I'm getting an error like as follows."Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."I googled and tried like using these lines of codes which wasn't useful.
sqlCmd.CommandTimeout = 0
sqlCmd = New SqlCommand("waitfor delay '00:00:60'")
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Mar 17, 2012
i want to which way is better when concentration is on processing speed. i want to call a method that compute some data that method is on another form in my windows form application then what you prefer is better way 1) to call that method in another form and use returned value or create similar method in form where it is required.i want to make it's processing fast.
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Oct 19, 2010
Consider a MyForm class that contains a shadowed implementation of Show(). It also contains a CreateForm() method, which accepts an instance of the form and calls the shadowed sub:
[Code]....
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Sep 17, 2010
I got a system which i want to insert, delete, update the data into my database and the data from database will be display using datagrid. The below is the coding for one of my button, delete.
Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
Try
btnSearchEmpNo.Enabled = False[code].....
Now I wanna set when user click on this button to delete a employee (for example) then the datagrid that i have in my application will not show the data of the deleted employee but in the background, the employee haven't been deleted from database.The employee only will be deleted from database when the user click on SAVE button.I know this application have to use RowState but how?
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Dec 14, 2011
What I want to happen is that the button from my system will remove the previous data from database and then insert new data to database from text file. Im done with inserting new data. The thing is that I dont how to control or where to put the Delete Command from my code.
[Code]...
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Sep 1, 2011
I'm using VB.net Express with SQLExpress. I've got the reader working in my program, but I'm trying to find the best way to go with SQL access in my VB program. I need to be able to write fairly sophisticated SQL queries from many different tables and then either load the data into VB arrays or? in order to do some calculations and field selection. I'm not displaying any data on the screen, like so many examples out there seem to illustrate.
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Jun 5, 2008
What is the best method to backup a sql database.Would it be simply to copy over the database to a seperate location or is there a proper sql way of doing this?
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Feb 8, 2010
[code].....
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May 24, 2010
I'm learning VB.NET on Visual Studio 2010. What approach should I be taking to connect my project to an SQL Express database?
I see lots of different buzzwords - ADO.NET, LINQ, ADO Entity Framework. Which is most relevant or is it dependant on what I wish to achieve?
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Dec 7, 2010
I just bought the MCTS Self-Paced Training Kit (Exam 70-561): Microsoft.NET Framework 3.5 - ADO.NET Application Development, and am trying to do the Lab Exercises now. Allready at the first exercise (point 8), where I am supposed to make an "UNIT TEST",[code]
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May 10, 2012
WinFormsApp Login passes information to .php (server based) Login (provided credentials are correct) to DB to retrieve Decryption Key. WinFormsApp then uses Decryption key on Hardcoded encrypted connection string and renders application usable.This would then eliminate the necessity to encrypt/decrypt a connection string at runtime, virtually rendering any unauthorized person with a useless software.
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May 20, 2012
I have a project in VB2010 it is well connected to the database (DB.accdb) access2007. I'm trying to save the photo into the database table using Binary method. I am successfully able to (Save, Search). my problem is in the EDIT button : I'm supposed to search first to return\display the info+Photo on the form controls (Textbox + PictureBox), now i want to do EDIT, i use sql string : SqlStr = "Update MyTable Set Field1 = '" & Text1.Text & "', PhotoOle = [b]????[/b]"
I'm not able to convert the PictureBox That contains the returned photo to Byes() using : ImageBytes = Ctype(PictureBox1.Image, Byte()) .... not working . -Or- ImageBytes = Ctype(DaraRead!PhotoOle, Byte()) .... not working either.
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Jun 6, 2011
I'm developing a project for gathering customer feedback using a Samsung Q1 Ultra, a cheap touchscreen PC. The project consists of two parts: a PC based application that builds the survey and stores the info on an SQL Server, and a survey viewer on the Samsung device which downloads survey data from the SQL Server and stores it on a SQL Server Compact 3.5 database.
My question is, how best can I transfer survey data from the SQL Server to the handheld device's database? Writing a tonne of code to copy data from one database to another seems overcomplicated - is there a handy function or somesuch that I can use to copy data from identical tables on these two separate databases?
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Sep 28, 2011
I am using ASP.NET.
There is a system that needs to POST data to my site and all they asked for is for me to provide them with a URL. So I gave them my URL [URL]
Now I do not know exactly how they POST it but now on my Test.aspx page I need to write code that will save that data to a database.
But how would this work and what must I do on my Test.aspx page?
I wrote some code in my Page Load Event that sends me an email on Page Load to see if they actually hit the page and it does not seem like they are even?
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Jun 5, 2011
Data Adapter on VB.NET. I'm having a problem with retrieving data on different tables.
Example database: BookInfo[INDENT]BookID: HSD993Z
Title: Introduction to SQL[/INDENT][INDENT]BookID: LDJA293
Title: Advance Computer Programming[/INDENT][INDENT]BookID: KSKL194
[code].....
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Jun 22, 2010
How can I read data from a .csv file I have opened into a variable for later use (i.e. plotting with zedgraph)? My csv file contains 100+ columns and 12000+ rows of data, with each column a different variable.
I've searched around a ton on this subject, and combined many methods I found on the net to my project but none actually do what I am required to do.
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Apr 23, 2009
I basically need to hold a lot of data - the structure is that of a five dimensional array holding integers.What would be the most efficient way of storing this in a file (I was thinking of XML - your opinion?) that would also be quick to extract.
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Feb 3, 2009
We are about to have a situation where our application needs to accept/give data to another application. Both applications are residing on the same machine.Two approaches being talked about are using a local web service that will do this or using files that will be used to share all of this data.
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Jul 4, 2009
I'm struggling to work with data in VB 2008, and find it extremely complicated! At first I couldn't even get a database to load, as VB 2008 kept complaining it was created with an older Jet engine.OK, I converted it to a newer Access format that VB 2008 finally accepted.
In trying to find out why changes weren't saved, I found a common problem was VB 2008 wiping out changes.OK I have told the compiler not to copy the older database file back over but to copy newer.Updates then supposedly happened --- no errors were reported --- but the changes were still not saved.It appears the update method didn't exist in the datatableadapter, but I got no error messages about that.
No update done.
I've used the tools to configure the dataset and datatableadapter.Automatic generation of methods like update, add new, delete, etc. were supposedly done.Now, when trapping the error, I'm told the update method isn't a valid one.I found little information on that. It suggested primary keys could be a cause, but adding or deleting a primary key has no effect.I can see the fill method, and it works fine.I can't see the update method. (Apparently it is in SQL which I don't know anyway.)
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