I'm writing my very first application for a customer of mine using VB.NET and I'm stuck with this: how can I open an xls file and put it on a datagrid? I've seen it's quite complex but the lack of examples by Microsoft doesn't allow me to do all the things by myself.
View 3 RepliesWhat I am trying to do basically is open an access query in a datagrid view and then be able to make changes to the datagrid and then save it back to the database.When I try to save:
Me.BindingSource.EndEdit()
Me.TableAdapter.Update(DataSet)
It says that update is not a member of the tableadapter... Why is that?
My text file is something like what you see below, and I want to populate the datagrid. Once I populate the datagrid, I'll use that kind of like an excel spreadsheet in the sense that I'll dip in and grab values based on row and column index to display to the user. I will also (on a different form maybe) display the same datagrid to the users so they can sort by column at their choosing.[code]The error I am getting is: Value of type 'Integer' cannot be converted to 'System.Windows.Forms.DataGridViewCell'.
View 1 RepliesI have a 'DataGrid' usercontrol on my simple little form and I press a button that opens a text file and populates the DataGrid like so,
A B C
1 2 3
3 4 4
3 1 3
Where A, B, and C are my column headers.
I also have a 'ListBox' on the form. What I would like to do is, allow the user to select one, two, or three rows (or all) in the datagrid, and press a button that will move the data from selected rows into my listbox (each row its own string in the list box).
I can populate the datagrib easy enough, but don't know how to access the cell data individually?
I am new to this and have almost 0 programming knowledge. I want to automate transferring data from excel spreadsheet to access. i surfed around on the net to see if there were examples of codes that i can copy.this is what i currently have.
[Code]...
I have a problem with my datagrid(I am noob sorry if its simple). The datagrid is binded to a data table. What i want do is when a product is added or an existing one changed then make that one the selected row in the datagrid. The SelectionMode of the DataGrid is set for the whole row.
Here is the code that i am currently using,[code...]
Now as you can see from my code i don't understand how the index can be wrong as the datagrid is binded to a datatable and the indexes would be the same, and i have the current row in the datatable and look for the index in the datatable and stored it as a Integer!
I have taken up a task where end user should be able to enter information via vb interface into microsoft Access database. This then will be displayed onto the Datagrid via VB interface. The program needs to be setup in a way that first entry by end user will flash upon 3 hours.
Example:
VB Interface
=========
Basket Number | Number of Trays | Run Type | Time In
1 | 1 | CNC | 15:00:00
[code]....
Values defined within database shows in this datagrid.The Datagrid works fine and I can insert values into the database fine as well however, I am not sure how to setup a timer so that when 3 hours are up the first entry into the database(shown on datagrid) starts flashing.This is needed so that the end user gets an alert when the time is up so that he can take the trays out of the oven.
In Summary: Can we really setup a timmer so that a value in the datagrid will flash at a particular time.Below is the image of an application. Here you can see the data on the datagrid however I want it to flash after 3 hours. So the first entry will flash after 3 hours following the 2nd entry.
i have a rich textbox with some data that need to be stored in a datagrid it refreshes every 30 seconds and its a player list. the problem is i know how to show 1 player in the datagrid but the next one i dont...
i dont know how to stop my CharArray when it finds an enter and from the enter that it put those value's in a new chararray...
my code :
Code:
' my timer
If Now >= ReqTime Then
DataGridView1.Rows.Clear()
[Code]....
I am saving some operational log information into a XML file. At any time the user can bring up a datatable to display the information. I don't want them to see the 'HOURLY' log. I can't seem to filter this out. Also I need to populate a list box with all the unique events for filtering.
Example XML:
Code:
<?xml version="1.0" standalone="yes"?>
<DocumentElement>
<LOG_x0020_Table>
[code]....
how do I call the events for a datagrid? I want to update, add, and delete records to a bound datagridview. Is there a simple way to accomplish this? Most of the Database connections are handled but how is the editing handled?
View 1 RepliesHow to change the alignments in DataGrid in Visual Basic.net 2003 because all the columns are aligned left default. Also is there anyway to change numeric column to show with 2 decimal numbers (eg: 51.2 -> 51.20)
View 1 RepliesI need to validate the users region against the region in the productlist. What I have is:
Several values stored in Session when a user logs in, one of which is Session("SLID") which is the users database primary key value and is used to perform a database lookup whenever a users info is needed. This is done via User.vb I am attaching the file
I want to print one of my databounded datagrid. I found this code in knowledgebase here: [URL]
Can i ask about this datagridprinter usage?
I have a datagrid in my project. The data connection is binded to it by the Tools -> Connect to a database feature in vb.net and it's working great. Since I have to use it for 2 countries how do I change the SQL in the connection and refresh the datagrid with the new data.
[Code]...
I'm trying to make my datagrids datasource change when you select a particular item from a drop down menu but all I get is blank cells! any ideas? I don't think it is changing the colums property automatically either.
If chooseType.Text = "Add / Edit Players" Then
updateDB.DataSource = PlayersBindingSource
[code].....
I need to find a way to take a normalized table, and display it in a crosstab format for users to enter and edit data in a data grid. For Example:
Table Structure.
MONTH CLIENT AMOUNT PRICE
01/01/2007 FRANK 45 $25.00
[code]......
I have a datagrid that I am populating from an Access 2000 query in Visual Basic 2008.
This code works fine:
With dgvCollections
.Columns(0).Visible = False
.Columns(1).Width = 235
.Columns(2).Width = 230
.Columns(3).Width = 220
.Columns(4).Width = 70
.Columns(4).HeaderText = "Loan"
End With
The query works fine, except that I want to change the alignment for one of the columns. I tried to add this line before the "End With":
.Columns(4).DefaultCellStyle.Alignment.MiddleCenter()
Which causes the error:
"Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated."
And this error:
"Expression is not a method."
See our Posting Guidelines for our policy on archived threads.I am confused as to where to place the following code snippet in my code. I put the function above my load event and the same exception still occurs:
An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in system.data.dll
[code].....
ive added a datagrid view to my form and ive also linked it to a database which displays the details i need. but what if i want to delete any rows(records) from the datagrid or edit. i need it to also change in the database. whats the coding? ive tried n tried but cant seem to get the code. its vb.net 2005
View 1 RepliesI have populated a dataset with the contents of a csv file. Here is a sample of the imported data:
Protocol,Process ID,Process Name,Local Address,Local Port,Remote Address,Remote Port,Status
TCP,4,SYSTEM,134.190.220.54,4505,134.190.184.193,139,ESTABLISHED
TCP,4,SYSTEM,134.190.220.54,3963,134.190.218.5,139,ESTABLISHED
TCP,4,SYSTEM,134.190.220.54,3816,134.190.176.154,445,ESTABLISHED
Here is the code that I used to import and display the data:
Code:
Dim sConnectionString2 As String
sConnectionString2 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" _
& CasePath & ";Extended Properties=""text;HDR=Yes;FMT=Delimited"""
[code]....
The problem is, all of the data gets displayed correctly except for the ip address. It gets truncated to "134.1892". How can I change the formatting for the "Local Address" and "Remote Address" columns.
I am building an application that has several forms to it and on my first form, I declare 2 variables that I will need to pass to at least 2 of the other forms. I call them
Public payPeriodStartDate, payPeriodEndDate As Date
on form2, I am needing to pass those variables to a datagridview to present to users. I have the following query that I'm trying to run from that form but I'm given an error that SQL is unable to parse the query:
Code:
SELECT Employeenumber, Exceptiondate, Starttime, Endtime, Duration, Code, Approvedby
FROM Exceptions
where [Exceptions].exceptiondate between '" & payperiodStartDate & "' and '" & payPeriodEndDate"
The datagrid is bound to the form and I'm using SQL 2000.
I'm using an unbound datagrid to make a balance sheet and I need to have a certain row sum the previous rows but it only concatenates (obviously the cells default as strings but I don't know how to fix it). I've really only worked on VBA and this is my first crack at .net Here's what I've tried that is wrong:
[Code]...
I am using Visual Basic 2008, and SQL Server 2005. I have a single-user client-server app (i know that sounds stupid, but its for future expandibility and also the fact that documentation was easier to find for SQL server than Access files).The app is basically a medicals records system.
In one of the tables, called 'visits', it stores the dates on which each patient visits the doctor, among other things like symptoms and diagnosis. Another table stores all the patient names and IDs along with other details, and a relation has been set up between the patient ID in the patients table and the visits table. So i dragged the visits table from within the patients table (to get only the visits for that particular patient), and dragged it onto the form to make a datagridview. However, the datagridview didn't seem to recognise MS SQL server's smalldatetime format, and tried representing it as a picture. When i changed the format of the column to text boxes, it gave me a type mismatch error (Inconvertible type mismatch between SourceColumn 'VisitDate' of DateTime and the DataColumn 'VisitDate' of Byte[].) That means, for some reason, it is trying to convert the smalldatetime data to byte before it shows it, which is leading to the error. How do i fix this?
Also, I remember seeing some option for using completely custom column types in the datagridview, but i cant seem to find it now. The options in 'Edit Columns' are very limited, but i would like to set it to a masked text box, or something with a fixed format. Can someone recommend a good column type for representing dates, and how to make the datagridview show that kinda column?
In our application we use IDataReader which actually call function from one.dll where weExecureDataReader()
We have many calls in application and in some places For some reason I am getting error message "DataReader already open" but I am not sure where.What will happend if I simple close that conection in the that .dll? Am I going to make trouble to database because one datareader left opened? I assume closing connection will close reader too and gargage collector will manage that left opened datareader..
I am currently developing a program that was first built within access using VBA.My program is a search form connected to an access database, which is itself linked to a dbf database.I managed the code from access to a new program, but I am stuck with one line of code;How can I open a form (which shows the filtered data) using a filter (a string built with the input boxes).
The code in vba is:
DoCmd.OpenForm "frm", , , Left(strWhere, lngLen), acFormReadOnly
where FRM = the form showing the data
strwhere = SQL string
lnglen = number of characters in strwhere.
How can I do the same in a Visual Studio 8 environment (Visual Basic -idontknowwhat-) ?
SQL connections confuse me sometimes In almost every SQL related code on the internet the routine is like this;
* Open connection
* Execute SQL command
* Close connection
Is it good practice to just open a connection when the application starts and use that connection until the application closes?I know that sequential connections are required when processing more queries, but what if I need to poll a certain Table every x seconds? Isn't is better to keep that single connection open for as long as the application is running (and re-open when a failure occurs) instead of opening a new connection every x seconds?
I am trying to create an xml editor that read and write xml. my code reads the xml with no problem and allows me to create new rows but when I try to "write" it over I get the following error: "Token StartElement in state Epilog would result in an invalid XML document"
here is my xml:
<?xml version="1.0" standalone="yes"?>
<MacroList identifier="test">
[code].....
I decided to rewrite my project. Hit another snag. How do I write the contents from a datagrid to a file and back into the datagrid again later? (Actually, I've done the writing ok - but for the life of me can't get the data back into a blank datagrid.
Here's what I done so far:
Imports System
Imports System.IO
Imports System.Text
[Code]....
I have a connection string in my app.config:
Code:
connectionString="data source=.sql2008 ;Database=Database1; Integrated Security=FALSE; Persist Security Info=True;" />
How do I change to another database (one of many) without using multiple strings? Can I change while the connection is open?
Code:
Dim myConn As New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("ConnectionString"))
If I use the CmdObj.ExecuteNonQuery() I got an error
I'm not having an open connectoin.