I am populating a datagridview not with a datatable but with a list of instances of a class I created. The data for the instances is read from a database.
Looks like this:
Public Function GetSecurities() As System.Collections.Generic.List(Of Security)
Dim com As New SqlCommand
Dim rdr As SqlDataReader
[Code]....
i am working on a window based student registration project using vs2008 and ms access database.what i have to do is to register students for main or comptt. exam according to the course they are in.The students are shown in a datagridview as per the course generated by populating comboboxes.i have checkboxes for main and comptt exam on the form.i want checkbox column in datagridview to select students either for main exam or comptt exam It means when i check say main exam checkbox and check some students or use "select all" checkbox to select them all,those students must be registered for main exam by updating the field "status" in database table by clicking a button.The updated value should be 1 for main exam and 2 for comptt. exam.i have generated the grid but now unable to register
View 6 RepliesI am creating a project in VB.NET in which one of the reports require that the name of employees should be displayed as column names and whatever work they have done for a stated period should appear in rows below that particular column.Now as it is clear, the columns will have to be added at runtime. Am using an ODBC Data source to populate the grid. Also since a loop will have to be done to find out the work done by employees individually, so the number of rows under one column might be less or more than the rows in the next column.Is there a way to create an empty data table and then update its contents based on columns and not add data based on addition of new rows.
View 1 RepliesMy datagridview is displaying records from table in database.When I go to add a new record the 'pencil' icon does not appear so when I click on save button update to database table does not take place.code behind save button is
BindingContext(TheatreBindingSource).EndCurrentEdit()
PatientTableAdapter.Update(TheatreDataSet)
PatientTableAdapter.Connection.Close()
i have spent all day trying to sort this ...any ideas and yes my theatrebindsource.allownew is set to true
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.
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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]
View 3 RepliesI have a datagridview with two columns a text box and a combo box. I can add to the combo box collection but can't determine how to remove part of a collection. Example combobox has 10 items as follows: 1,2,3,4,5,6,7,8,9,10.
I only want to show a number 1-10 when another label has the same associated number.I have 10 labels named 1-10 but I only want the combobox to display a number 1-10 when the corresponding label has been selected previously. So, if labels 1-5 have been selected by the user than I want to have my dgv combobox to display only 1-5 and remove 6-10. I have searched but have not been able to find a similar post.
I am completly flummoxed!!! I have writen code for updating my table from a form but when I use the same code only changing the table names it wont work I get the following message: "Update requires a valid Update Command when passed DataRow collection with modified rows" My codes are as follows:
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I have a grid view which uses SQL to calculate information that I need! I want to put this calculated total into another table in database.
SELECT StaffDetails.StaffID, SUM(HolidayRequests.RequestTotalDays) AS Expr1
FROM HolidayRequests INNER JOIN StaffDetails ON HolidayRequests.Username = StaffDetails.UserName
[Code]....
It basically calculates the total number of approved holiday requests for a staff member which is correct. I want this number to then update the HolidayTaken field in another table each time a holiday is approved.
I have tried an update however you cannot use an aggregate in an update as I have found.
When ever I try to update a record from data grid using a dataAdapter record it always showing ' update requires a valid insert command when passed data row collection with new rows' From specific sql server Table only. Resulting me holding up a project.
View 4 RepliesI have two datagridview's both are databound. First one shows items for sale and the second stores all the items that were sold. I am trying too transfer selected rows from one to the other but no matter what I keep getting told "Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound."
View 2 Repliesi have a datagridview which has a datasource of a SQL database. In this database i have a column which has a boolean value, and in my form, it is used to specify whether a checkbox is ticked or not. What i need my program to do is color the cells of the datagridview based on if the checkbox is ticked or not for the particular rows which have it ticked in the database. Here is what i have, but it doesnt work:
Code:
Dim count As Integer = 0
While DataGridView1.CurrentCell.RowIndex <= DataGridView1.RowCount
If CellIDCheckBox1.Checked Then
[code]....
what im trying to do here is loop through the datagridview and see if the checkbox is ticked or not and coloring it based on that.i have also been messing around with some LINQ code, but that doesnt seem to work either..
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?
If using a datagridview to update a database and the datagridview is bound to a bindingsource which has its datasource as the table to be updated: where dshould you place the tableadapter.update(mydatarow)
View 5 Repliesi have a datagridview which has a datasource of a SQL database. In this database i have a column which has a boolean value, and in my form, it is used to specify whether a checkbox is ticked or not.
What i need my program to do is color the cells of the datagridview based on if the checkbox is ticked or not for the particular rows which have it ticked in the database. Here is what i have, but it doesnt work:
Code:
Dim count As Integer = 0
While DataGridView1.CurrentCell.RowIndex <= DataGridView1.RowCount
If CellIDCheckBox1.Checked Then
[Code].....
NB: I'm using Visual Basic.NET?My form has 2 DataGridView controls. One of these is bound to a DataSet, the other isn't visible - at least not until the user selects a uniqueidentifier cell in the 1st grid.When the user makes this selection, the 2nd grid will become visible and display the row from another with the same id as the one selected in the 1st grid.So, basically, I want to dynamically display data in one grid based on user selection in another grid.My code looks like this so far...
Private Sub RulesGrid_CellClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles RulesGrid.CellClick
Try
FlagsGrid.Visible = True
[code]....
I am having a loading problem, the problem is my formating code takes way to long to load.
What I have is a datagridview that is loaded by one table and I want to format the cells based on data from another table, the following code works, but it gets slower and slower as I add more records to the data.[code]...
I have DataGridView display Customers Details. The DataSource are from DataSet. After the user have created a new customer record and updated the SQL SERVER Table, Instread of refreshing the whole DataGridView I am trying to add new rows with data from the TEXTBOX into the DataGridView and it generated this error message: Rows cannot be programmatically added to DataGridView's row collection when the control is data-bound This is the coding which the error was generated from:
Private Sub FRefreshDataGridViewRow()
'use strmode to determine New or Edit existing record
Dim strCell1 As String = CType(Me.txtCustId.Text, String)
Dim strCell2 As String = CType(Me.txtCompName.Text, String)
[code].....
I have an ASP.NET app with lots of textboxes all over the page that need updating at various points through program execution. These textboxes actually belong to a certain class, so for easy updating I thought I could create a Dictionary(Of string, object) and add the control.ID and the control to it and then for updating do something like this:
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I have an application doing the following:
- Treeview with customers
- on clicking a treeview, for every project of this customer, a new MDIchild opens, where the products of this project are displayed
- the MDIchild is basically a DataGridView, which is connected to the products-table via a DataView
my Problem comes after changing a value in the products DataGridView:
- if i do not change the row, the changes will not go back to the database after an update
- if i do change the row after entering a new value, everything works fine
The strange thing is, that in both cases, the value in the DataTable is changed, the DataSet is "hasChanges=True" and the DataRow's state is "Modified".
I want to save changes made in the Datagridview back to the database. I came accross Martin's solution HEREbut get an error: NUllReferenceExpection was unhandled. Object Reference not set to an instance of an object. Here's my code:
Dim con As New SqlConnection("Data Source=.SQLExpress;Initial Catalog=MyDb;Integrated Security=True")
Dim cmd As SqlCommand
[code].....
Here is my code, but its the other way around, it commits changes to the datagridview when the database is updated.
Imports System
Imports System.Data
Imports System.Data.OleDb [code]............
I am filling my datagridview with the code below
Dim trh
As String = deneme.Text
Dim pt As
[Code].....
I'm using DataAdaptors to pull data into a DataGridView. I want to make changes to the data via my DataGridView and then update the database when the user clicks the 'Update' button, but I can't figure it out. Below is my code.
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here's my code in filling a datagridview,which i retrieve from database mysql,
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how to update database when values in the datagrid change?
I am using VB NET 2005 and Sql server 2000.I have 2 tables which have 1 to M relationship.let's say:ProductionMaster (ModelNo, Description)ProductionDetails (ModelNo, ItemNo, ItemDescription, QuantityPer)once the form load, I fill the tblProductionMaster which ModelNo into txtModelNo.so once the txtModelNo got event "Changed", the datagrid will be filled base on ModelNo. (in this case I use dataset, datatable and dataadapter).but the I only use this query SELECT ItemNo, ItemDescription, QuantityPer FROM tblProductionDetails WHERE ModelNo = '" & txtModelNo.text & "' and filled it into datagridview.the question is how I update the DATABASE if user change the value in datagrid?let's say, user change the ItemNo from "A" to "B" in column ItemNo in datagrid so the rest column (ItemDescription and QuantityPer) will be followed change, how I update the database once the cell lost its focus?
View 1 RepliesI have an issue with a data base updating it won't update for me in debgging mode it is stopping here on this bit of code which is highlighted in red. the error which comes up is .(update requires a valid update command when passed datarow collection with modified rows.)
Public Sub UpdateDataSource(ByVal ChangedRows As database.dataset1)
Try
'The data source only needs to be updated if there are changes pending.
If (Not (ChangedRows) Is Nothing) Then
[CODE]...
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
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I have connected my access database to vb.net and program is capable to show the database in the datagridview. but what i want is when i change the data in the datagridview and click onto update button,changes i made should be saved in database so when i execute the application again i should be able to see the updated database in the datagridview.
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I'm facing a problem while updating data in a database through datagridview. I'm changing the cells using a for loop and then updating db using below code. All data rows get updated but 1 (the last one).
Here is the code I'm using :To load data:
ds = New DataSet
cmd = New SqlCommand(query, cn)
[code]....