Looping through rows in a DataView
I have created a dataview from a datatable.
My question is how can I loop inside the dataview?
I know that in a datatable I can perform a loop like this:
For Each oRow as DataRow in iDataset.Tables("tableName")
Msgbox oRow(0).ToString
Next
How do i do that for a DataView?
im trying to select some rows based on a criteria, i was wondering is it faster if i create a dataview (based on the criteria) and then loop through the view? or should i loop through the entire datatable and check the criteria manually.
View 5 RepliesIf want to do a DataView.Find on a DataTable that is already 'ORDERED' by the Column I am seaching, so a DataView.SORT should not be necessary, but it throws an Exception if I don't give a .sort command before the .find command. Is there any way to avoid this apparant duplication ? and speed up the search time. Its a very large table - 1 million rows. I am using VB 2010
View 6 RepliesI got a problem with dataview that get data from datatabel (Col1 : ID,Col2: Time) and I'm sorting by Time in desc ... when the values for example {40.21,80.21,70.25,25.2} the dataview sorting them as I need but when one of values goes above 100 for example {40.21,80.21,100.25,25.2} the dataview always sort the highest number is the buttom, I don't know why ..
This is a sample code
Dim dt As New DataTable
dt.Columns.Add("ID")
dt.Columns.Add("Time")
[CODE]...
Makes the following statement about the code below:
**"The computer evaluates the loop condition in the Do...Loop statment to determine whether the loop instructions should be processed. In this case, the inputsales <> String.Empty condition compares the contenst of the input sales variable to the String.Empty value. As you know the String.Empty value represents a zero length, or empty, string if the inputsales variable is empty, the loop condition evaluates to True and the computer process the loop instructions. *If on the other hand the inputsales variable is not empty, the loop condition evaluates to false and the computer skips over the loop instructions.
Based on the code I think it is the opposite: ...that while the inputsales value is not empty it should evaluate to true and process the loop and if it is empty it should evaluate to false and skip the loop?
See below.
Option Explicit On
Option Strict On
Imports System.Globalization
[CODE]...
i am trying to add several rows to a dataview before bindng it to the datagridview. I have tried several variations of the below code but only the last row will actuall load into the grid. Probably doing something stupid.
My code is:
dvInspectDetail.AllowNew = True
Dim newRow1 As DataRowView = dvInspectDetail.AddNew
newRow1("IDetail") = mDetailNo.ToString
[Code].....
I have an XML that looks like this:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="library.xslt"?>
<Library>
[code].....
I have a sqlDataSource that runs a stored procedure that returns a table of the days of the month that was passed in as a parameter, arranged as they would in a calendar. It also returns a second table which contains the event details associated with certain days of the month.Basically, how would I go about accessing the values contained in the 2nd table that is returned by my query?I have tried putting the result of the .select in a dataset, unfortunately I get a cast error. If I try to put it in a dataview, I only get the first table.[code]
View 3 RepliesI have a form where I open an Access database with 3 tables. I have defined datasets and dataviews for these three tables in the main form. I want to open a new form and access and update the tables using the dataviews I've already defined. When I try to access a record from the dataview using the new form, it's not defined. Can I pass the data between forms or do I need to redefine it in the new form? This is the first time I've tried to use multiple forms.
View 6 RepliesI am trying to create a basic webpage that will check a column of a database table to see if a "UPC Code" is taken already, to prevent duplicate use. I'm fairly new at .NET programming, but have built asp pages before. I'm just stumped :/
I have a textbox that a user can type in a number. The page successfully checks to see if the textbox is blank and reports the error, and if there is a value, it's supposed to bind that textbox number to a gridview to see which Item# it's associated with. But for some reason, my code is not binding the value of the textbox to the gridview.
Code:
<%@ Page Title="Home Page" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false"
CodeBehind="Default.aspx.vb" Inherits="UPC_Checker._Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
[code]....
I have the following code, I just want to create a dataset add some records and display it.
Make the DataSet.
Dim scores_dataset As New DataSet("Scores")
' Make the Students table.
Dim students_table As DataTable = scores_dataset.Tables.Add("Students"
[Code]...
I have a form which is primarily pulled from Table1. Table1.fieldA is an integer representing a project phase. In the current Access display the form displays not the integer, but a String stored in Table2 that holds integer/String pairs representing all the phases.I'm trying to figure out the best way to reproduce this in my .NET formview. I could write code that would parse the int and display text, then reverse the process at save or insert, however then the code has to be updated if a new phase is added to the database. draw the String values from Table2 while preserving the binding to Table1 but I haven't figured out how.
View 6 RepliesHow Can I Row Filter with a condtion on colam where Coloum1 = > 0
View 2 Repliesi guys, Ive been stuck on this problem for awhile now I need to read an XML document into a dataview object.At the moment I am reading the Xml into a dataset
Public Function GetDataSet() As DataSet
Dim ds As DataSet
ds = New DataSet
[code].....
I need to search all cells inside a dataviewgrid in VB.net starting with "www" , once i found one cell apply a background color to the complete row and get the next cell with the same String.[code]...
View 2 RepliesHow to select data by Id from Dataview . I want to show this it in deferent Textbox
View 6 RepliesHow Can I Select Data from Dataview by Id. I want to use it in Invoice I have All Produck List in Dataview by Id. I just want to Put the Produck Id in A textbox and it will fill the all produck information in other textbox from Datview.
View 1 RepliesI'm trying to pull a table from an SQL database and sort it on the "Date From" (DtFr) column, which represents the start of a lease. I thought it would be as easy as this:[code]......You were right about the string value. I added a data column called sortDtFr to the datatable and gave it System.DateTime as a datatype and iterated through the rows setting the new column's value equal to the old one casted as a Date. Here's the code for those interested:listing all drives with GetLogicalDrives()..I am getting ( A:. C:, K: )
View 1 RepliesThis is my data stored in table1,
[Code]...
It works with 1 parameter (i_index) but if I also use i_datum, I get an error like: "Conversion from string "park_id = 100" to type 'Long' is not valid." Public Function detail_kalender(ByVal i_index As Int16, ByVal i_datum As Date) As DataRowView
Dim dv As DataView
Dim anyrow As DataRowView
dv = New DataView
With dv
.Table = myds.Tables("kalender")
[Code]...
I have a solution in vs2005 vb.net.I have a 'personalized' dataview with different datacolumns.I'd like to add a 'personalized' textbox in one of these columns. How can i add it ?
View 26 RepliesThis is a continuation of this thread...
[URL]
So - is creating a DATAVIEW like this in a class doable? Then when the DATATABLE changes the DATAVIEW is always kept freshly updated?
Public Class caseBAL
Private _connection As New SqlConnection("Server=fps-lap-szsqlexpress; Initial Catalog=Casefiles; Integrated Security=SSPI")
[code]....
I would like to know how to make a DataView global to a particular form.The DataView is currently created and returned from a function within a public class residing in another .vb module.[code]I would like to make objDataView global so I can use the RowFilter instead of doing a new DataSet every time the user clicks on this RadioButton.
View 7 RepliesI am using VB express 2008 with MsAccess as database. How to bind a dataview to a listview i.e. how we can add data to a Listview from a Dataview.
Dim
DailyExpenses As New DataTable("DailyExpenses")
Dim dv As New DataView(DailyExpenses)
I read in some post something like under but when i tried to implement that ItemsSource is not a member of Listview:
listview.ItemsSource = dtView
i have DataSet with 3 tables in it and i want to asign all 3 tables into one DataView.i know its possible to assign each table seperatly by doing this:
Dim dv as New DataView(ds.Tables(i)).DefaultView
but i need all the tables in the dataset and not only the i based index table i also thought about using DataViewManager which can be assigned to the whole Dataset, but it doesn't have the RowFilter prophety which i am using Later on my code.
how can i bind a checkbox to a dataview field? the dataview will only have 1 row, but i want checking + unchecking the checkbox to update the dataset. how can i do that?
View 6 RepliesI start by looping through a string array, parsing out the strings I want and saving them to a temp table (I believe this part is working).Then, I take a DataView of the tale to get only the unique values from the rows.Then, things get messy, I need to get these unique values into my dataset. I been trying to do so using the DataView and also by passing the View to a new temp table then looping the values into the DataSet
View 1 RepliesI have a dataview which I want to copy to another object that is not referenced by the original one.
What is the syntax to do this? The code below creates a new reference to the same object so I cannot modify one without modifying the other:
Dim filteredCategory As DataView
filteredCategory =
Me.ProductCategory
How to create a dataview from a datatable?
What is the basic use of the created dataview?
Is it possible to create sql union like filter in dataview
View 3 Replies