I have a DataGridView.datasource bound to LinkToSql. I fill the data based on a sequence number. If the sequence number is not part of the the data, I will need to add a record. This should be easy and make sence, but it would appear, at least to me to be a bit more difficult.The grid will not add a new record if the LinqToSql query is empty
View 6 RepliesI'm maintaining a Datagridview on my Windows Form. When I open the form all the contained records are displaying, which is from SQLserver Table ok. when I open the form the datagridview should show just black and after I insert a new record that particular record should only display on that form gridview. [Code]
View 1 RepliesI'm going to use an existing query on an SQLCE database on Windows Phone. From what I understand, the only way to access a local db is via Linq2Sql.So, your challenge, if you choose to accept it, is to convert this fairly complicated query to Linq. I have doubts whether the linq driver is smart enough to use the exists functions.The inserts are for context only, to give you an idea of the db structure
DECLARE @OrderProducts TABLE(OrderID INT, ProductID INT);
DECLARE @Products TABLE(ProductID INT, ProductName VARCHAR(32));
INSERT @Products VALUES
[code]....
I wonder if somebody could point me in the right direction. I've recently started playing with LinqToSQL and love the strongly typed data objects etc.I'm just struggling to understand the impact on database performance etc. For example, say I was developing a simple user profile page. The page shows basic information about the user, some information on their recent activity, and a list of unread notifications.
If I was developing a stored procedure for this page, I could create a single SP which returns multiple datatables covering all of the required information - resulting in a single db call.
However, using LinqToSQL, this could results in many calls - one for user info, atleast one for activity, atleast one for notifications, if I then want further info on notifications this may result in further calls - multiple db calls.
Should I be worried about the number of db calls happenning as a result of using this design pattern? Ie, are the multiple db handshakes etc going to degrade my db etc?
I'm using LinqToSql to talk to my database. It's working great but I would like to know if there are pending changes. I know how to endedit() and submitchanges() on the underlying context. But is there a property that will tell me if changes have been made? I've looked through the properties and methods of both the bindingsource object and the datacontext but nothing is popping out at me.
View 3 Replieslately I've been experiencing LinqToSql + Sql Server Express 2005, and it was a great journey (muddy) anyway .... I'm at the point that I want to make a Backup/Restore for the database backup for SSE is as easy as a simple copy paste of the mdf file, but the problem that I can't copy the file while the server is using it, server doesn't let the file go untill the app is closed or after about 4 - 6 minutes of idle time,
[Code]...
I have a linqtosql dbml where I dropped a stored procedure into the designer interface.
Stored procedure name:
GetUser(@userid int)
Select * from users_tbl where userid=@userid
[code].....
I'm using LinqToSql classes in an ASP.NET website and let's say I have an entity named Testimonials. Two pages utilize this type - the first being a list of all existing Testimonial records and the second being an add / editor with which to manage the records. [Code] This allows population a DataGrid with the returned items, however on the add / editor page we alter the query ever so slightly: [Code] This query dies, prior to even trying to populate anything, with the following message: [Code]
I have pretty much identical methods for other data objects which have been and still are executing just fine. One immediate difference I can think of is that this table has been recently updated in the database, removed from the dbml designer and re-added to the dbml designer. None of the other tables have undergone this process for some time. [Code] Why is this exception occurring and how can I configure my project appropriately to correct the issue?
I have a smalldatetime column in SQL that can have a null value, but when I try to insert a null value using SqlTypes.SqlDateTime.Null and LINQtoSQL it puts in 1/1/1900 instead of NULL.
What is the best method to insert a null, or am I doing it at the moment. If I am using the correct method at the moment, what should be done to prevent the 1/1/1900 being displayed on my fields in a WPF application.
Dim query = (From p in Parent _
select _
p.ID, _
Tags = String.Join("|", p.Child.Select(Function(c) c.Tag.TagName).ToArray)).Take(100)
In the above query, when using Take to limit the rows returned, a separate SQL query is executed for each row to return the 'Tags' field. If I remove Take(100), a single query to sent to Sql Server.So, how do I limit the number of rows returned, while preventing a new sub query being executed for each row?
I hav a web service which pull records from a database and I am hosting these services in IIS which works fine but I am trying to retrieve the record and display the record in a listbox displaying the time field as the text for that record.I have created the following function
public sub get_data()
dim dt as new data.dataTable
dim service as ws webservice.webservice
[code]...
i have created an add button in my datatgridview.when the user clicks the add button i would like the cursor to be positioned at the first cell of the new row.i created a new add event, and can get to the last row, and select it.but how do i set the focus onto the first cell ?this is the code i am using:
Private Sub TestButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles TestButton.Click
Dim RowCount As Integer = Me.grdAccountTypes.RowCount - 1
Me.grdAccountTypes.FirstDisplayedScrollingRowIndex = RowCount
Me.grdAccountTypes.CurrentCell = grdAccountTypes.Rows(RowCount).Cells(0)
I am having problems adding a new row to a datagridview control in my form. I have a simple formwith a textbox, a button and a datagridview. When the user types in an item number and clicks on the button, the system will populate the datagridview with the relevant data from the database.All these works fine but, when the user tries to add another record, the first record added to the datagridview is cleared off the datagridview before the next record is displayed. I would like the datagridview to add all the records without clearing the screen. The datagridview is not bounded to the database.
View 12 RepliesI have a form with a DataGridView binding to an Access database. Everything works fine and it populates perfectly. Except when I delete a record. I get the following. I found a few threads about the issue but I cannot resolve the issue. Can some one give me a step by step to resolve this. [Code]
View 4 RepliesI am able to delete one, but I need to delete all records, do you know any command that will work?
am using this code but still wrong databasename.table(tableName).delete() and am also cannot compact the database properly... am always get this error
" Database already Exits" .. this is my code
[Code]....
I'm currently developing a application in VB.Net. I'm using the DataGridView to display my data on the form. I have a EDIT button on the module and I need to know how can I populate a selected row record into the textboxes from the DataGridView.
View 2 RepliesI want to add to my site a simple table/excel-like feauture that will display some values. So, I added a gridview. I don't use Datasets or database biding at all. All I have is a small form with two entries. When the user clicks a button, I want to add some values to the datagridview control as a new row. How do I add a new record to datagridview control in VB.NET?[code]...
View 2 RepliesI have a DataGridView connected to a DataSet. I want to allow the user to update and insert new records on the RowLeave and CellLeave events. The Update method works:
Me.ExpensesTableAdapter.Update(Me.DataSet1.Expenses)
i made on my parent window a datagridview that connect to a databasei have also a menu i have added a button
in the dialog i have 7 label's and 7 textbox's
-Name + textbox
-Sur name + textbox
[code].....
I'm using the following code to add a new record to a table in the database. However, the DataGridviewthat's binded to the DataTable, isn't getting refreshed /updated.[code]...
View 8 RepliesI have design a form in which there are three input field with one submit button.
Below submit button i have added DataGridview control also.
Now if i enter any data in those three input fields and press submit button then its should first popup for adding record or not, and if i press yes then the record should inserted into database table and also its should show in DataGridview.
I use this code.. it work to delete my sql data but it delete all the data. I just want to delete the selected record. I also have try the others code but the code not delete from my dataset. Just this code that I've try and delete from my database but the problem is it delete all the record..
Dim con As New SqlConnection
Dim CM As New SqlCommand
Try
con.ConnectionString = "Database=ITtry;" & "Data Source=SLSDB\SLSREP;" & "Uid=sa;Password=***"
con.Open()
[Code] .....
I'm using Visual Studio 2008 and SQL Server 2008 and Crystal Reports.
Windows form with datagridview and a printbutton.
Is it possible, if I select a record in the datagridview, to print that record when I click the printbutton?
I had following code:
If File.Exists("OTS_Username.txt") Then
File.Delete("OTS_Username.txt")
End If
Dim numCols As Integer = dgvExp.ColumnCount
Dim numRows As Integer = dgvExp.RowCount - 1
[Code]...
I have a DataGridView bound to a datatable which comes from an SQL Server database.When the user edits a record my update statement changes the field datetimemodified to reflect the last date and time the record was edited (as stored procedure). The new value for datetimemodified is not brought into my DataGridView.
1) How do I refresh a DataGridView bound to a DataTable? Is there any way to refresh or resync only records that have changed instead of the entire DataTable? (Note: my update statement is working fine. I'm only wondering about refreshing the DataGridView.)
2) Would it be better to change the value of DateTimeModified on the client side so that I can avoid a refresh (assuming that this is the only reason I need to refresh the data)?
I have a form that contains a datagridview, which is working properly. I want the user to locate specific records that are displayed in the grid. To that end, I have a sub that uses the datatable select method to find rows within the defined record set:
Dim
strFind
As
String[code]......
As far as I know this is working, as no exception is thrown.Is it possible to have the grid display this record if it is found without having to rebuild the grid?
I would like to save records in my unbound datagridview to a table in my database. The datagridview was manually created during design and is not bounded to any table. After the user has filled in the rows and columns, I would like all the rows to be inserted into the table. How do I go about this?
View 11 RepliesI am trying to find or search record from a datagridview so I could replace it with a new data from a textbox. I used the datasource.find() method the only problem is...If the my Table consist only of one Row, the find method replaces that one row everytime i insert a data. I just couldn't figure out how to datagridview works with if else statment.
View 2 RepliesI have a BindingSource1 and a DataGridView1.
[Code]...
how to transfer datagridview record to listview?
View 4 Replies