Calculations For Data In Datagridview Dynamically Loaded From Access Database
Feb 2, 2010
I have a database that dynamically loads from Access into a datagridview. I have to enter data manually into one column in this datagridview. I need to be able to perform calculations to this data, for example I need to sum the data in this column, sqaure it and substract it from individual sqaures of the data in the cells. I should be able to sum it sum(22,33,44,53,67,23)^2-sum(22^2,33^2,...23^2). The number of columns keep changing depending on the database I choose to load, so I need to code this dynamically too. I am not really a VB person. I did the same in excel using Visual Basic and I am trying to do it in this Visual Basic environment.I built a tool in excel(VBA) that do some statistical calculations and data analysis and I am trying to build the same in Visual Basic.
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Apr 9, 2010
I have three tables in SQL server which I would like to show and access on a form. Table 1 contains account data, address, contact details etc. Table two contains data attached to a Person, tel no , Mobile no, Email etc. Table three contains details on what awards the person holds, i.e. one person can hold several awards.
Therefore I have a one many relationship between the first two tables and a one many relationship between the second two tables. This is set up in SQL
The first two tables are shown on a form, table 1 via a set of text boxes, table 2 via a datagrid control.
I would like the functionality whereby I could select a row in the datagrid showing the persons name and find the Persons_ID number then use that as a filter to a second datagrid view so that only the selected persons awards show in the datagrid.
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May 12, 2009
I have a datagridview on a form , and I just want to take this data and save in access database, if I enter a direct value in this code , it works but it does not take a value from datagrid,I am work on this from last two daysIt throws an error saying that parameter userid has no valueError I believe is at DV.Rows(0).Cells(0).Value I think it cannot get value from Datagridview
Private Sub btnupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnupdate.Click
Dim ds As New DataSet
[code].....
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May 25, 2011
I am doing project now.i am a beginner for vb.net. I display data from ms access database to datagridview.Now i want add Button in Datagridview in one coloumn and when i click the button it will display the particular record and i want to display the diagram for that data. I am using filter.but it doesn't work.my code is
[Code]...
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May 19, 2009
I have made DataGridView in the designers and connected an Access database to the datagridvies and the Column headers appear as they should and when I check in preview mode all the fields are correctly populated. However, the DataGrid is not populated in normal mode at all. I have been trying to run the project but nothing is happening. What can I do to populate the field.
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Dec 14, 2009
I am struggling to understand fully, I need to bind data from an access database to a datagridview. (the DB simply holds a list of product with their stock code, description etc) I need to bind this datagridview to a products collection without using a dataset to bind to the datagridview. I really don't understand this fully.
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Oct 23, 2010
I have a problem that is bugging the hell out of me..... I need to know how to update an access database from an unbound datagridview using vb.net 2008 here is my code but it dont want to work, I need the simplest way.
[Code]...
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May 17, 2009
currently i had a program which working fine when its running in the solution explorer,but after published,problem comes.my datagridview cant show updated data while my database access already update...my datagridview only show existed data.could it be my datagrid problem?i get my data programmatically or is my INSERT command doesn't update the dataset?but in the solution explorer does show the dataset was updated. [code]
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Mar 19, 2009
i have a textbox that i want to format the value and i placed it in the Validated event.. it works ok when a user enters a value but when data is being loaded from database, it doesn't format.
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Jun 11, 2009
How do you create an access database dynamically?
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Oct 20, 2011
I am debugging an assembly which I loaded dynamically with Assembly.Load(Byte[]), but I am facing some problems.First of all, I can't move the yellow arrow in Visual Studio 2010 to step into other lines of code, and also I am getiing exceptions ("Cannot find the method on the object instance.") when trying to do a quick watch on objects from a third party library (controls from Infragistics for example.)
Dim data = My.Computer.FileSystem.ReadAllBytes(file.FullName)
Assembly.Load(data)
When using Assembly.Load(String), everything works fine, and there are no problems.
Assembly.Load(IO.Path.GetFileNameWithoutExtension(file.Name))
EDIT: I tried loading the debugging symbols for my assembly with Assembly.Load(byte[]. byte[]), but it I sitll get Exceptions when trying to debug objects from third party libraries.
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Oct 26, 2009
My goal here is to get stack trace information from a dynamically loaded assembly. If the dynamically loaded assembly just throws the error back to the caller, the stack trace information doesn't tell you the location in the dynamic assembly where the error occurred. If I throw my own exception, passing in the original exception, it will get added as an inner exception and will have the information need. I'm trying to avoid changing all my dynamic assemblies to throw new exceptions.
Public Class ErrorPlugin
' Example Function from plug in DLL
Public Function SimpleExample() As Double
Dim RentedUnits As Double = 42
[code]....
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Jun 15, 2012
I have a form which creates controls dynamically and adds event handlers by itself (already coded that part). As for now, I have a hidden table with the object list which loops through the controls and finds it by name (using the Me.Controls collection). How ever, does anyone knows if a dynamically created control may have a special unique code ?
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Feb 7, 2010
I was wondering if there is any way to load data from excel sheet into a datagridview in VB2008 dynamically. I have looked at few data connection codes but all of them involve the excel sheet and thw workbook name. Is there anyway that I enter the excel sheet name in a inputbox and the data from excel loads into datagridview without hardcoding the sheet name. I know data can be imported using the below code, here the programmer has to mention the excel workbook name, path and sheet name. [code]I am developing a program to perform some calculations and my data is in a number of excel workbooks and worksheets. I need to be able to bring the data from these excel sheets into the datagridview to perform calculations. So I was thinking if I could mention the excel sheet name in the GUI and then accordingly the data from that particular sheet would be loaded into the datagridview to perform calculations.
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Oct 27, 2011
I have two usercontrols. One is loaded statically another dynamically.In the aspx page I can write as follows for static user control.
ProgramAddSchedule.onNewProgram += new AddProgram.OnNewProgramClick(onNewProgram_btnHandler);
But dynamically loaded control's event I am not able to get
Control myUserControl = (Control)Page.LoadControl("~/View/EditScheduleProgram.ascx");
How do I get the event of the dynamically loaded control?
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Dec 21, 2008
I am trying to create a plugin system where plugins can be dynamicly loaded (we don't know how many there are, what their classes are called, ...)This is sample code for a plugin:
Code:
Public Interface IPlugin
Sub bla()
Function bla3() As String
End Interface
[code]....
This code SHOULD msgbox("yay") when it finds a type that implements my IPlugin interface. Yet it never finds one. I can't find what I did wrong. It gets to the debug.print("2"), but never gets past the "If GetType(IPlugin).IsAssignableFrom(t) Then".
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Jun 20, 2011
I have the user control that is loaded dynamically. When the user save the data by clicking on the Save button, a raise event is passed.
Public Sub RaiseCloseEvent(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent Close(sender, e)
Debug.Print(String.Format("The control {{0}} was closed by {{1}}.", Me.Name, sender.ToString))
End Sub
In the save button I have called the RaiseCloseEvent as follows:
RaiseCloseEvent(sender, e)
Now, how can I close the user control form? Any Idea? I have used VB.Net language.
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Nov 16, 2009
We loading and executing an assembly dynamically from code. While reading a dynamically loaded assembly how can we find an interface within the assembly which is marked (decorated) by another class like below
<ExternalDataExchange()> _
Public Interface IwfService
Event firstEvent As EventHandler(Of ExternalDataEventArgs)
End Interface
Here how can we find that we have interface "IwfService" which is marked with "ExternalDataExchange()" class.
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Jun 4, 2011
I can save my data to access database and in the access database field I set it to date/time.But problem is when I get the value out from the database.. the format is always month/day/year hour:minutes:seconds example today: 5/2/2011 12:00:00..How to get the value into listview becoming May/2/2011 without the hour..Here's my code to get it from database ListView1.Items(i).SubItems.Add(dt.Rows(i)(14).ToString).The second problem is.When I would like to edit, how can the datetimepicker get the listview value ? [code] info: using access 2003 (.mdb) the Date of Birth field has been set into Date/Time.
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Apr 20, 2010
How do you manipulate a string that you have selected from a Combo Box that has been upated dynamically from an MS Access Database table?I have strings that are "1, Surname, Forename" and need to get both the number, and the surname out to put back into a different database table.
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Sep 18, 2007
I have a DataGridView which displays info from a Database. I need a couple of the columns to be able to do basic calculations such as +, - etc - nothing more complicated really. I am a bit stuck as to how to gte this working.I have tried the code below with no joy:[code...]
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Jun 22, 2010
I am trying to import data from an access database to a access database that my project uses I am having problems with combo box fields in the database with the data. I want to import what is displayed instead of the numerical key value. Example: The combo box displays employee names but the value stored is the key value from the employee table so instead of importing John Doe it imports 2 is there a way to make the actual name instead of the number?
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Apr 22, 2011
I am trying to access a txt flie in my project. This file contains many records that I wish to retrieve individually to make further calculations with.My first problem is how to connect to the file in my project, I have no clue howw to do this, have tried many different ways, but still no success.I also wist to have a textbox that I can type the (airport name) so that the streamreader will search for that record, similar to a google type search.
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Nov 18, 2010
I need a little guidance in the right direction to help with using data from a dataset in calculations. I've watched the "How Do I" Series and it was very helpful in setting up the relations and tables. I have setup a couple tables to hold values that won't
be updated and the user will never see. Lets say I have 5 columns, ColmnA to ColumnE, and the row count is variable. What I can't seem to find is an easy way to loop through using the variables. As an example, Lets say the equation would be outputted to a
textbox:
textbox1.text=row1(ColumnA*ColumnB+ColumnC^ColumnD-ColumnE)+row2(ColumnA*ColumnB+ColumnC^ColumnD-ColumnE)+etc to end of rowcount
Does anyone know if a good tutorial to point me in the right direction or a code snippet that may get me started to follow the logic? I'm using VS2010Express with a SQLExpress database if that helps.
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Apr 20, 2010
This program is very difficult for me, but I must get threw it or I cannot finish... What I am doing is making a Database of foreign Languages with the spelling of the words and the pronounciation inside the database... The USER enters a paragraph of words into the translator textbox and pushed translate. The program has a DATABANK of words with the phonetic spellings and matches the word, then translates to phonetics. The problem is that new words keep appearing inside the language. So I incorporated a Database of 2 fields
[Code]...
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Aug 13, 2010
How can i send a table values into DataGridView? I am using Access Database.And one more thing i want to know that.Before sending values into Datagridview i need to work 2 or 3 tables and that result should be keep one Temp Table , that TempTable i want send to DataGridView.Here 2 or 3 tables work means i want to applay leftjoin between two tables and coming result should be keep one temptable and again i want to right join with temptable to other table.This Concept i recently worked on VB, now i want to do work on VB.NET.Is there any way to handel this task? Any i how i am sending Code which i implemented same concept in VB.[code]Here in VB code i used Functions, i called Functions in the FORM and i declared the Functions in the Module. By using Funtions and Recordset i did job. But how can i handle in VB.NET?
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Nov 19, 2010
can anyone teach me how to save data in microsoft access database and retrieving it back from database?[code]so, how do i save it in that and how do i load their data by typing their ic no only..
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Sep 18, 2009
I need a good book for beginning to use VB 2008. I have some (limited) experience in using VBA. I want to access a database (SQL) and have access to the data set as variables?
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Jan 4, 2010
I got the code below from a book but it doesnt seem to work:
[Code]...
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Feb 5, 2010
I have a little problem with converting data from a datagridview to my access 2007 atabase.t's been some years since the last time I've opened Visual Studio 2008. So, probably it's something easyo do.
This is my code so far:
Dim i As Byte = 0
While i <> dgInput.Rows.Count
[code].....
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