C# - Linq-to-Sql: Use LinqDataSource To Programmatically Retrieve Data?
Dec 10, 2009
I'm using a LinqDataSource to populate a basic GridView in ASP.NET. The user has the ability to filter the results, so I use a few WhereParameters and the Where within the LinqDataSource.My client has requested an option to export the filtered results to a file. Easy enough to pipe the data into a file, but I would prefer not to rewrite all the where clauses in the codebehind. I would simply like to extract the full set of results, preferably by using the already configure LinqDataSource.When using LinqDataSource's OnSelect method, the e.Result has the data I'm after, but my GridView PageSize is set to 20, which means that the LinqDataSource (rightly so) only fetches the first 20 records.Is there anyway to get hold of the entire data set?
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Apr 9, 2010
I have three tables in SQL server which I would like to show and access on a form. Table 1 contains account data, address, contact details etc. Table two contains data attached to a Person, tel no , Mobile no, Email etc. Table three contains details on what awards the person holds, i.e. one person can hold several awards.
Therefore I have a one many relationship between the first two tables and a one many relationship between the second two tables. This is set up in SQL
The first two tables are shown on a form, table 1 via a set of text boxes, table 2 via a datagrid control.
I would like the functionality whereby I could select a row in the datagrid showing the persons name and find the Persons_ID number then use that as a filter to a second datagrid view so that only the selected persons awards show in the datagrid.
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Nov 26, 2010
I am trying to create a LINQ query statement that retrieve intersecting data from 3 datatables (dt, dt1, dt2). My first attempt to do so with the following LINQ query statement was successful: [code] However in my design, I would need the LINQ query statement to be dynamically generated, because I want a user to be able to retrieve intersecting data entries from VARIABLE number of datatables. In this case, the first option is not as good as the "INTERSECT" query operator, with which I can just easily connect each SQL query statement with a "INTERSECT" operator. The problem is that my second attempt using the "intersect" operator fails, and after many trials and errors I still can't get it to work. [code]
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Oct 21, 2010
I have two tables:Orders OrderProducts - An order can have 1 to many orderProducts records associated with it.What I am trying to do (unsuccessfully) is to implement a GridView search using a LinqDataSource wherein the search returns Order results where any of the OrderProduct.Manufacturer columns contain a search query.
I was hoping the following would work, however it seems lambda expressions do not work within a Where clause of a LinqDataSource (in VB):
[Code]...
how to get this working within the LinqDataSource definition, or will I have to handle and set up a custom OnSelecting event?
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Sep 11, 2010
I have code like this...
Public Class nomatch2
Inherits System.Web.UI.Page
Private Sub nomatch2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack Then Return
log.PgInit("nomatch2.aspx")
'Do other stuff here
End Sub
End Class
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Oct 27, 2010
I have a datatable with one column, I am trying to retrieve the values in the table into a string array using linq.
Dim dt As DataTable = DataAccessManager.ExecuteSelectQuery(selectStr).Tables(0)
Dim strArr() As String = (From dr As DataRow In dt.AsEnumerable.AsQueryable _
Select dr("MASTERID").ToString()).ToArray()
I get an error "Range variable cannot match name of a member of the 'Object' class"
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Mar 19, 2010
Is there a VB.NET equivalent to the C# var keyword? I would like to use it to retrieve the result of a LINQ query.
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Oct 21, 2009
How can I convert an object of type System.Data.Linq.DataQuery to System.Linq.IQueryable?I'm working with Visual Basic/Silverlight, and the source code of my query is as follows:
Public Function Get_Cli_Pag() As IQueryable(Of V_Cliente_Pagare)
Dim Qry = From P In Me.Context.Pagares Join C In Me.Context.Codigos On C.Codigo
[code]....
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Apr 11, 2011
i want 2 select data from data gridview and want retrive that data into another form in to the textbox ...is it possible ? i 'm doing like this for that
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.[code...]
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Mar 11, 2010
I want to obtain the individual data in rows and columns from my database. I mean after loading the data in a data table.... I think I need some attributes of the data table, so as to obtain data from the rows and columns.
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Jun 12, 2009
I am developing a software using datagridview (vb6 feels better) and i am using virtualMode.it shows the focus blue box but it is not possible to fill data to the first cell programatically.also i have used from within a button_click event as follows
1- MyGrid.CurrentCell.Value = 22
2- MyGrid.Rows(0).Cells(0).value = 22
3- MyGrid.BeginEdit(True)
3- MyGrid.CurrentCell.Value = strData
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Sep 10, 2010
I'm trying to automate a data entry. I have a form with several textbox, combobox, etc.. and i will like to know if there is a way to get a specific row of data from a binding source and duplicate it so I can then simply make the necessary changes to a few columns.
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Jun 6, 2009
I would like to populate a Combo with all the type names that a DataColumn can be ("System.String", "System.Boolean", etc). How can I do that without having to manually add the combo items?
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Oct 10, 2011
I have properly configure the database connection. I wanted to get data from the database to 2 text boxes.
[code]...
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Nov 23, 2009
1. user writes he's details (textbox1 for username, textbox2 for password)
2. user hits "Login"
3. application tries to retrive data from sql server. (in this case localhost/127.0.0.1)
4. application retrieves data from test/tables/members
5. if the specified account information matches the servers data, it will let you through to the next form. Else, it will give an error that the user/pass is incorrect.
Now look, the table looks like this
[id] | [username] | [password]
1 username password
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Jul 30, 2009
I am trying to execute the code below to list the select item in a checkbox to the body of the mail
Dim CheckedValues As String
For Each item In txt_panview0_ddinput1.Items
If item.checked Then
[Code]....
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Jan 11, 2010
How to retrieve data from database using Web services on VB?
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Jan 4, 2010
I am retrieving data from a csv/txt file using oledb driver
ConnString = "Provider=Microsoft.Jet.OleDb.4.0; Data Source = " & System.IO.Path.GetDirectoryName(strFileName) & "; Extended Properties = ""Text;HDR=YES;FMT=Delimited"""
strQuery = "SELECT * FROM [" & System.IO.Path.GetFileName(strFileName) & "]"
In the last line I am getting following error if the filename is large
Is not a valid name. Make sure that it does not include invalid characters or punctuation and that it is not too long.
My question -
Is there any limit to filename or the select query or there is some pattern which I need to follow?
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Jun 8, 2011
I need to retrieve data in array. We are asked to get id number, name and section and put it in a array and then if we clicked retrieve button it will prompt an inputbox requesting for the id number of students and after we input the id number of the student the name and section will be in the msgbox.
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Sep 8, 2010
i created a database in my visual basic . and in this database i created 1 table...
i created also a query which is calculating the SUM of a colonm..i want to know how i can do to retrieve this data inside a textbox whos is on my program..ans of course i want that data to be update everytime i inserte data in this colonm...
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Sep 21, 2011
we want to retrieve all data in our database but we dont know how to do it.. hmm.. we just use to retrieve data one by one.. its just by the search button.
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Mar 11, 2010
I have managed to connect vb.net to Microsoft database access but now i am struggling with the code to authentication log in. when i log in to the form i want it to display the user name in the label in vb.net form.
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Apr 4, 2011
I want to retrieve data from a this link:
[URL]
I have used this code:
Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
[Code]....
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Jan 6, 2011
I'll create Database in Visual Basic using MsAccess.
But I want to know that how can retrieve from Access which selected fields are needed...
For example., I've 10 fields in student mark list,
ie, Rollno, Name, ..., Grade...
From those 10 fields, I want to show only 5 Fields in another VB form...
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Dec 17, 2011
my program has a datalist which list out all the item from datasource and display the detail information on different textbox the problem happened while i click "vitamin a" from datalist, and the "supplier name"will display "daily medicine",then when i click "vitamin b", it will display "sunny medicine",finally when i clicked back "vitamin a", the supplier name still remain "sunny medicine" which mean it does not change from "vitamin b"?
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Mar 11, 2010
I have 2 checl boxes bol1 and bol2 and i stored a record after ticking one of them and now i want to make a function to retrive what i stored in the access data base in check boxs as well according to the ID. the table name is check_table and the columns names are "bol1 , bol2" the type is (yes,no).
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Mar 11, 2010
How can i retrieve data information displayed on the hyperterminal or is there any way to redirect the information being displayed on hyperterminal to a file?
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Mar 18, 2010
how to retrive thousands of data from access faster
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Jun 12, 2009
how to retrieve data from mysql using vb.net as frontend. I created database in mysql and able to insert data from vb.net but i dont know how to retrieve data from mysql.
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May 6, 2012
I am making a survey-application in winforms that is connected to a MySQL database. Now I want to show the alternatives of a question, and how many answered each question. I have a table for alternatives called tblAlt and a table for answers from users called tblAnswers.
There are only 5 alternatives for each question. Is there a way to get each alternative, and how many answered each of them with one query?
This is what I made so far, but this is definitely wrong:
SELECT tblAlt.altText, Count(tblAnswers.answerID)
FROM tblAlt, tblAnswers
WHERE tblAlt.questionID = " & CInt(questionID) & "
[Code]....
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