Forms :: How To Retrieve Values From The Database
Jun 7, 2012
i am new to vb.net and dont have any idea about using datareader.i am right now doing a project on vb.net and am facing an issue.i have a form, where in i have to select the matching records from the database and show it in various textfields. as far as the query execution is concerned, i have successfully completed it, but i am facing an issue now. Suppose, i have an Id of a student, and he has registered for 3 courses, when i give the query something like select students.studentid,courseid,midtermmarks,finalterm marks from marks,students where students.studentid=course.studentid;it gives me multiple records.my doubt is, when i get multiple records, and which is true(in the case a student has registered for multiple courses), how can i traverse through the resultset and fetch the values in the respective textfields.
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Feb 9, 2009
In VB.net how do you retrieve an value from a object in a different form.
eg:
' on frmMain
MsgBox ("Say ""Hello World"" Mr. " & frmOther.txtName.text)
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Sep 16, 2009
I stored rtf format directly into the database. Like in database
[Code]...
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Apr 30, 2010
I would like to save Gridview with all of the columns value and reload the same grid without using database?
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Dec 7, 2010
i apologize if this isnt up to your developer lingo, i really do lack proper developer/English skills)Just for starters this request is 100% genuine...im not some student trying to get you guys to finish my project, this is purely for educational and personal information for myself.Scenario: (brief)(i am using Visual Studio 2010)I am wanting to build a project that generates a printable purchase orders report and retreieves and save the entered details to a access Database (MDB).
In the purchase order application im trying to develop i want a user to be able to select existing clients from n table in the access DB. in which will then fill a portion of the CLIENT detail section in the application. i want to then be able to uses these client details to create a unquie purchase order ID containing all client details aswell as the purchase order list for that client this such as products and labor or whatever is inputted in the fields. (I have attached a screen shot of a brief example of the form layout, might give you more idea. - screen shot made in VISIO)
[Code]...
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Oct 20, 2010
How can i retrieve data from sql database and put the values in textboxes?
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Dec 30, 2010
If i have two textboxes textbox1 & textbox2 and button1 in my ASP.NET and SQL Server database
Database records are:
ID Date Seats
1 15-Dec-2010 1,2
[code].....
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Mar 21, 2012
I am having trouble in browse & then save an image to SQL Server.ALso I want to retrieve that image.This is the code to browse image & show it in PictureBox1 Control
Public Sub SelectImage()
With OpenFileDialog1
'.InitialDirectory = "C:"
[code]....
But don't know how to pass it to image parameter .Also is there any way that I can save image on Local drive & just save the url /location/name in database?
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Nov 15, 2011
When we input values, and retrieve them in forms, we can see them. but when we look directly into our database, we can't see it.
Here is our codes to add values.
Private Sub Add_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Add.Click
If ClassName.Text = "" Then
[Code].....
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Dec 15, 2010
I am building VB.NET application that takes data from text files that are exported from a legacy DOS program. These are written to a datatable and displayed in a datagridview. Right now my code simply loops through the datagridview and inserts the data into the database (SQL Server). There is a requirement now that the client number must be checked before the insert to see if it exists in the database. If it does, then the value of one field (tax rate) is checked against the value of the field in the datagridview. If there is a difference, then the rate is to be updated in the database and the data that was in the database is to be written to a history table for audit purposes. If the client number is not there, then we are to do the insert (which is already written). I want to know what is the most elegant and efficient solution for this problem.
I need to compare what is in the database table with what is in the datagridview, update the history table for records that exist, and then insert new records.
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Oct 18, 2009
I am trying to use eBay API and I have already signed up and connected to their API, now I don't know the VB.NET code needed to retrieve the information, such as "GeteBayOfficialTime" is a command I can use for their API, but how do I go about connecting and requesting "GeteBayOfficialTime"?
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Nov 29, 2009
I am trying to retrieve cell values from a datagridview.I am trying to use the DataGridView.Item().Value property to pull each cell value into a temp variable to it can be added up, but for some reason it is not accepting any variables that I use to count the rows, only integer values.Here is an example of the code I am using.
Dim tempVariable as Decimal
Dim i as Integer
Dim Total as Decimal
[code]....
For some reason it does not like the variable i, and only wants integer values.
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Jun 24, 2012
I want to retrieve checkbox selected values from sql database such that the selected checkbox list values get ticked in the form![code]...
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Apr 23, 2010
With this code above I would like to retrieve the data values, like sex, to checkboxs. So If the value of the field in database is "Male" my checkbox4 must be checked, case else checkbox3 must be checked.[code]...Retrieve Data Values To Checkbox?
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Mar 11, 2010
My problem is I want to be able to read through this xml document and populate a winform before validating it and then storing it into a table.[code]...
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Apr 24, 2009
I built a small website and there will be only one admin, so in the admin panel I am asking for a password with a value that I do not retrieve from a database, I just hard coded it in the function in code behind, I know this is wrong though I don't know why.
So is hard coding it in web.config the right thing to do? and how?
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May 24, 2011
I am trying to Query a table with data from another table and return a filtered result
Dim i As Integer = 0
For Each lrow In dtlist.Rows()
Dim lat As Double = dtlist.Rows(i)("Latitude") 'CDbl(Me.SubjLat_txt.Text)
Dim lon As Double = dtlist.Rows(i)("Longitude") 'CDbl(Me.SubjLon_txt.Text)
[code]....
Obviously doesnt work but the idea is thats the Value i need to put in the Value Column of dtlist In short the project, loops through one table(dtlist) of address's and gets the distances of it from the address's in the second table(dtsold) then gets the higest value from dtsold within a certain distance?
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Mar 17, 2012
I am trying to populate an array with all the unique values in a string, to prevent me ReDim'ing an array every time I find a value that not already contained in the array I am trying to create (consumes alot of time), I am trying to get the unique values first so I only have to ReDim once and after that I can simply iterate through the string and the array I have will be the correct size for the unique values I aquire (I am using this...)
[Code]...
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Jan 17, 2011
I have a report made in Crystal Reports XI. The report is generated and exported to PDF in visual basic script using COM interface. Generally everything is running smoothly, but in one case generation breaks with error: Failed to retrieve data from the database. Details: [Database Vendor Code 9421]
Database used is MSSQL 2005 connected over ODBC to CR XI. When I am opening report with exactly the same parameters in Designer, everything works fine.It looks like it is data related, but it is hard to trace since the whole report is pretty sophisticated. Anyway I spent half a day on crawling over Dr. Google and it seems that he has no clue what might be an issue.
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Apr 8, 2010
i need to make a database application that can write/retrieve cells/datasets from/to a database i buyed a book in there was an example of how to create a database application while debugging i had the "Object reference not set to an instance of an object." error and it highlighted this code
objDataRow = objDataSet.Tables("KlantenTable").NewRow
now the problem is here i declare something later in the code i write to it
objDataSet.Tables("KlantenDataTable").Rows.Add(objDataRow)
[Code]....
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Nov 3, 2010
I have a textbox AND 3 checkboxes; checkbox1, checkbox2, checkbox3
In textbox we have 1,2,3
If I type in textbox1 = 1,2 then
checkbox1 and checkbox2 will be checked and checkbox3 will remain unchecked.....
How to do this in vb.net
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Nov 28, 2011
I'm trying to retrieve values from a look up table with the selectedRows method. But i'm getting the exception InvalidCast. It says: Conversion from string "Codigo" to type'Integer' is not valid. Well my code is varchar not numeric.
Try
frmMovimientos.codDestino = dgLook.SelectedRows("Codigo").ToString
frmMovimientos.desDestino = dgLook.SelectedRows("Descripcion").ToString
Catch ex As Exception[code]....
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Oct 30, 2011
Retrieve and set values from a runtime created text boxes. following code is what i wrote to create a textbox in my form.[code]...
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Oct 30, 2011
Public Class Form1
Private tb = New System.Windows.Forms.TextBox
Dim posx As Integer = 0
[code].....
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Jun 10, 2011
I m entering information of each person in Employee Information form and saving it in MS Access database.Now i want to Show the data of each person Individually and the information of the next person will be shown on the next button click. to do this what shall i use a crystal report or windows form.
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Aug 14, 2011
I have a Login class with a doLogin() method which is called from a Button.OnClick() event from my Login form.If the login is successful, I then instantiate a User Class with the users details (username, first name etc.).The problem is, I don't know the best way to store this User object .I want to be able to retrieve details from this Object 'on-the-fly' from other forms, Such as UserObj.getFirstName(). And then have the ability to remove the object for when the user logs out, for example.
I really don't want to have to pass the object around to every form that would need it. That seems unnecessary and I'm sure there's a much easier and logical way.If it was possible to store objects in My.Settings, then It'd be perfect, but you can't (i think?).
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Oct 27, 2010
I am creating an xml file with LINQ as follows...
Public Sub CreateXml()
Dim db As New MDataContext
Dim Customers = <gallery columns="3" rows="3">
[code]....
Could i mix local values with the ones returned from the LINQ query...Something like the following?
Public Sub CreateXml(ByVal **Col** As String, ByVal **Row** As String)
Dim db As New MDataContext
Dim Customers = <gallery columns="& **Col** &" rows="& **Row** &">
[code]...
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Feb 4, 2009
i need to create one search box using textbox and the result will display on listbox.
I have textbox1 as inputbox, button1 as search button , listbox1 to display the value , Database1.mdb as my database.
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Jul 23, 2009
My scenerio is a form with a button, when clicked opens a form dialog. The dialog allows the user to enter a text box. I want to read the value of the text box from the main form into a variable to be used with an SQL statement. The following code is used to create a new instance of the form dialog if one does not exist:-
[Code]...
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Mar 3, 2009
I'm instantiating a WebBrowser object and programmatically clicking a button to navigate. Is there a way (property, method, or voodoo ritual) for me to check the browser after it lands on the new page to see 1) the form method that was used and 2) the post data?
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