Is it possible to get the row index of a DataTable so that you can access the previous and next row? For example I have a DataTable that contains two columns ChapterTitle and PageURL. This is for a table of contents of a book. ChapterTitle is the chapter name and PageURL is an HTML page that contains the chapter (chaptername.html). When going into one chapter of the book I want to be able to tell which is the next and previous chapter.
After finding the chapter that I'm currently in how can get the next and previous rows?
When i load my database i load it into a DataSet.When i search the database i load the results in to a DataTable.I want to find what index a search result has in the DataSet.When navigating the dataset i can use this code to get the index ds.Tables"Filmer").Rows.IndexOf(ds.Tables ("Filmer"). Rows(inc))But i can't make i get the dataset index of a search result from the DataTable.I thought that i could use the same code when navigating the DataTable, but it only returns.
i am having trouble putting a value in a textbox. Each time a ticket is sold i put the total price in a textbox, each time a ticket is sold for the same concert it increases by adding its self to the total price. It works at the first sale, but after that it breaks down. here is the code
Private Function DisplayMoneyTaken() As Integer Dim totalMoney As Integer 'open the database connection
How can i get the index of an element in datatable which i got using the select method of datatable as
dim d as new datatable= 'some data source' dim dr() as datarow dr=dt.select("some condition")
now i want to find the index of first or second item which i have retrieved in data row. i mean there index in data table with out use of loops as loops take a lot of time when there is huge data in data table.
I am wanting to update a datatable which is been created dynamically. Each row has a unique Id column. How can I retreive the row and update a column in it using the Id column
I've got two data tables with store numbers. I need to find out what store numbers are in one data table that arent in another.say one table A might look like:
34, 35, 39
the other table B may be
34, 35, 39, 45
I need to find the 45 If I use nested For Next I can get matches but anything not a match would show up not just the 45 value as the next progresses.
I know this is old hat, but when you're faced with a problem you cannot solve yourself, you need to find someone with the correct answer.In short, go to the wise.
I am working on an application that has a lot of records, and it uses a listbox control bound to a binding source attached to a table in a data source.A new record with data is added to the binding source's attached table, and, of course, to the underlying sqlServer database table:
I have a data set in the User control . It was working fine but now when I started using another copy of the user control it started showing error DataTable internal index is corrupted: '5'.
dim dv as dataview dv = new dataview(ds.tables("Names") dv.rowFilter ="CatNum ='"& val&"'" 'This will always give one row only dv.item(0)("Names") = myvalue ' here the exception is occurring
I have a datatable with 10 records linked to a datagridview. When I initially load the datagridview, row 0 in the datagridview = row 0 in the datatable - based purely on the order they load, and the datatable's default sort order. I then filter my datagridview and am left with 5 records. Is there a way of determining programatically, the actual datatable row number of a row displayed in a datagridview, considering that row 0 in the datagridview is now not necessarily row 0 in the datatable?
In a DataTable object, is there added overhead to looking up a column value by name thisRow("ColumnA") rather than by the column index thisRow(0)? In which scenarios might this be an issue. I work on a team that has lots of experience writing VB6 code and I noticed that didn't do column lookups by name for DataTable objects or data grids. Even in .NET code, we use a set of integer constants to reference column names in these types of objects. I asked our team lead why this was so, and he mentioned that in VB6, there was a lot of overhead in looking up data by column name rather than by index. Is this still true for .NET?
I have a question related with VB.Net Code. I see that the DataTable we can use: DataTable(0)'This return a DataRow with the selected index In the intellisense I see that this functionality can achieve with a extension... but, If I create a extension, always I need refer the Extension before to use it
I need to sort a datatable. I do it with linq this an example
Dim query = From c In dt.AsEnumerable _ Order By c.Field(Of DateTime?)("LastPurchaseDate"), _ c.Field(Of String)("LastName") Descending Dim dv As DataView = query.AsDataView
But my problem is that i need to sort the fields not by passing the name of the column but the index of that.
i have two datragridviewcomboboxcolumn,and two textbox column in a datagridview.each combobox column is binded to separate binding source.
column names are sl_no,col_empname,col_empworktype,Col_Hours etc.and displaymember,datapropertyname,valuemember and for comboxcolumn are col_empname:-emp_name,emp_id,emp_id col_empworktype:-worktypename,worktypeid,worktypeid
Public numUsers As Integer Public fNameUsers As String = ("......users.txt") Public UserRecords As Usersclass() 'note... this line is in a module '
reader = New System.IO.StreamReader(fNameUsers) numUsers = 0 'Split the array up at each delimiter of "," and add new objects ' Do While reader.Peek <> -1 ReDim Preserve UserRecords(numUsers) oneline = reader.ReadLine
I have an List(of String), i need to find the index of a particular string in that list. I have searched msdn , but i am confused over the predicate methods. I have never used predicates. This i what i have tried
vb 'on button1 click Dim Heads As List(Of String) = Me.GetSelectedNodes() Dim tmp As Integer
Ive got two lists (each representing a table in a DB, so they are related). lstTransaction has t_id, date, and cust_id. lstCustomer has Name, and cust_id.For each item in lstTransaction Id like to find the index in lstCustomer where lstCustomer.cust_id = lstTransaction.cust_id.
I have loaded datatable to listview.Now when i try to do a selected index and retrieve data to display in respective text box. I find some error "input string format incorrect".but when i directly load from folder it works fine.
Data that retrieved from Datatable.Im not able to find the index of the row. But from folder and listed in ListView.Index value is found.
Dim breakfast As ListView.SelectedListViewItemCollection = Me.LOV.SelectedItems For Each item1 In breakfast index += Double.Parse(item1.SubItems(1).Text) Next
How I can find the index for the listview on a listview click event to something like this: Code: Private Sub listView1_Click(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) MessageBox.Show(listView1.Items(e.Index).SubItems(1).Text) End Sub
I don't want to use for each integer in the listview as i would keep getting the loops which I would hate to use it. I only want to use something like e.Index. I know that the index is not a member in e, but I don't want to use listview item check event due to loops. How I can find the index for the listview items without using for each integer as only using e.index?
I am using the stack class to store a collection of lines. <code>Dim myStack As New Stack(Of Line)</code> I want to find out what the index is of one of the lines that are in the collection and I'm not sure how to do this. i tried to use array.indexOf:
How I can find the index for the listview on a listview click event to something like this:
Private Sub listView1_Click(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) MessageBox.Show(listView1.Items(e.Index).SubItems(1).Text) End Sub
I don't want to use for each integer in the listview as i would keep getting the loops which I would hate to use it. I only want to use something like e.Index.
I know that the index is not a member in e, but I don't want to use listview item check event due to loops.
how I can find the index for the listview items without using for each integer as only using e.index?
