I have a combox and a datagridview on a form, the combox filters the datagridview but doesnt have Distinct values. I found this on one of your post. I have a Products DB Table with ProductID, Series, Description and UnitPrice, I am trying to filter the the datagrid using the column Series with the combobox but i get multiple values of the same thing in the combobox, where i would like to make it Distinct.[code]
View 6 Repliesi have a requirement like i need to filter out the distinct values from an array to another array.
Dim str As String
For Each str In all
If (Not all2.contains(str)) Then
all2.Add(str)
End If
Next
i tried the above logic to get the distinct list but it is telling contains and Add are not the members of system.array?
I'm trying to create a Windows form application which uses a few data grid views to pull data back from a SQL Server database. I've managed to get the data back okay from the tables but what I want to do is filter that data dynamically based on values input by the user from a combo box and a date time picker. Each of the data grids display production data for a machine but the combo box and date time picker will allow the data to be filtered by shift and date respectively - how to I pass the values of these to the SQL query returning the data?
View 4 RepliesI'm having some trouble extracting a distinct value out of a dataset.. I have a database table with 5 fields,
ProjectName, VendorName, ExpenseType; TxnDate; Amount
In VB6 I would have several different recordsets opened one after another to
A. Find all the unique project names within the table (and put them into a For/Next loop)
B. For each unique project name open a recordset to look up unique vendor names applicable to it (add For/Next)
C. For each unique projname, unique vend combination find unique exptype....for next loop....
D. For each unique projname, vendor name, exptype, date combination, sum up the dollar amounts...
The end effect is that you have a net dollar amount for each unique combination of project/vendor/expensetype/date.I dont like doing it like this because I have to keep hitting the database, I wanted to know if there was something I could do within the actual dataset which will be filled when I open the application with the values of the entire table..I got to ds.tables("Text").select.distinct( ....not sure how to proceed and everthing I've read online leads me into a complicated direction of creating new datatables...
I am trying to filter the first column of a listview which holds date values. If the date is less than 21 days from today it deletes the row from the listview.
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i want to display two values from two columns of same database table..i could get only single value..eg...i want to display emp_name and emp_id in the same combobox...i dun want to use another combobox for emp_name...when displayed it should be like "emp name=XYZ and emp id=E123".
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I have a combobox which contains few objects in Items. When the user selects any item from the combobox the values from the Object member variables are stored in the textboxes on the form.The user will change the values in the textbox and then he will select another item from the combobox.
View 10 RepliesI have a DGV bound to a bindingsource with a column that uses a DataGridViewCombobox, that has a DataTable for it's datasource. This all worked fine at first.But I removed a row from the DataTable that the DGV combobox uses as its datasource. Now when I try to load the form that contain the DGV, I get an error "DataGridViewComboboxCell value is not valid" for each row that contains the value I removed from the DataTable.It seems the value of the column must be a member of the combobox Listitems. Is there a way to allow values not in the combobox ListItems. I don't want the combobox listitems to be locked in for the life of the application.
View 2 RepliesHow do I get the other values of the selected item of the combobox so that I can save it to my table? This in my function
Using cmdTeachers As New SqlCommand("SELECT TeacherID, Teacher, Dept " & _
"FROM tblTeacherFile " & _
"WHERE Dept = 'HS' ", cnn)
And I have this on formload
Me.TeacherBindingSource.DataSource = Me.GetTeachers()
Me.TeachCombo.DisplayMember = "Teacher"
Me.TeachCombo.ValueMember = "Teacher"
Me.TeachCombo.DataSource = Me.TeacherBindingSource
I would like the user to enter positive numbers (decimal or whole numbers but no fraction) using combobox. However the user can only enter the numbers using a number key pad built in the combobox. The number key pad will appear once the user click the down arrow of the combobox (I am not sure if there any predefined feature built into vb.net 2005 that has this property). The number key pad should contain the numbers 0-9 and decimal(.).
View 2 RepliesI am trying to get distinct values in column 2 of a DGV using the following LINQ query:
Dim AllocatedRoomTypes = From r In Me.AllocatedDGV.Columns.Cast(Of DataGridViewCell)() Select r.ColumnIndex = 2 Distinct
but I get the following error:
Unable to cast object of type 'System.Windows.Forms.DataGridViewTextBoxColumn' to type 'System.Windows.Forms.DataGridViewCell'
I understand that the problems lies with the Cast, but I do not know how to correct it.
What I am trying to acheive is this:
Value is Column 2 of DGV
Double
Double
Single
Twin
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I have a three column table which lists every person, every event they may have attended, and what percentage of the time they were there. I would really like to display this on one page with the person names on the side and the event names across the top.
Here' an example of what I have:
NAME EVENT %ATTENDANCE
Smith Rock Climbing 50
Allen Rock Climbing 78
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I am using strongly typed dataset and have many tables in that. The problem is now I want to filter data from
GetData()
function which has a query like
select * from table_name
How can I filter a particular table and distinct values from it. Also if I try to filter it return all column but rest have null values except the one I asked, so I cannot assign it as a datasource to a datagrid or combobox. How can I do this..
I have a database which need to be assigned into array arr()(), e.g.
arr(0)(0) = aa arr(1)(0) = ab arr(2)(0) = aa
arr(0)(1) = bb arr(1)(1) = ba arr(2)(1) = ba
arr(0)(2) = cc arr(1)(2) = cc arr(2)(2) = cc
I need to find distinct / unique value in each arr(k)(0), arr(k)(1), arr(k)(2); where k=0..2. Then i need to insert the result into array cat as follows:
cat(0)(0) = {aa} cat(0)(1) = {ab}
cat(1)(0) = {bb} cat(1)(1) = {ba}
cat(2)(0) = {cc}
I've tried code below but it doesn't work. The assigning process into array arr()() from DB is OK. Problem only come up if I try to find the distinct value (If Not (cat(j).Contains(ds.Tables(0).Rows(i).Item(j))) ... End If).
For i = 0 To 2
list(i) = New Integer(3) {}
For j = 0 To 2
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I have a List(Of Hardware) - the List is called HWModels
Class Hardware has the following Properties:
ModelName
Status
CPUStatus
MemoryStatus
DiskStatus
The List is populated by reading a CSV file, once it's populated, I want to return the distinct records based on the ModelName
I've attempted by doing it as follows:
(From a In HWModels Select a.ModelName).Distinct
But this isn't right because I end up with a list of only the ModelName's and nothing else.
How do I get the Distinct function to return all of the other class members within the list?
Like "SELECT DISTINCT(Col)" in sql query, how do we perform this in datagridview?[code]...
View 3 RepliesI'm pretty new in Linq and the first problem I've is to select the Distinct values from a ObservableCollection( Of T)
I've tried with[code]...
Im having trouble getting the sum of a "Status Column" It is unbound. It has 2 Items "Active and Inactive" I would like to have lblInact.Text to show the total of Inactives of that column.
View 20 RepliesI got a combobox that I populate with items by using databinding options which works fine, but what if I only want to only select the distinct items, was trying to do that but no avail so far. if I could do that just by using an sqladapter in code but is that what I should really do ?
View 2 RepliesI have this online quiz that generates random questions, but the only problem is that it repeats the previous questions. I have limited questions (I have 10 questions in my table, but I have limited the number of questions to be 5. The output would only display 5 random questions) which I named as RequiredRecords.
question_id
1
3
4
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I have tried to visit this question, but it doesn't resolve my problem. Below is some of my code and SQL statements I used.
I figured out that there's nothing wrong with my query on creating random questions and I can display it with no duplication, but there's something wrong with my other codes that makes the program having a duplication.
Code Behind using VS2008 3.5
Partial Class Student_DetailView
Inherits System.Web.UI.Page
Shared TotalRecords As Integer
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I am trying to do this:
Dim viewdata2 As DataView = fxts.fxtsdata.Tables("clients").DefaultView
Dim viewsorted2 As DataTable = viewdata2.ToTable("clients", True, "Surname", "Name")
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Supposing the referenced List below contains 2 elements:
Dim Countries = From c In List _
Select New With { .Country = c.Country, .CountryID = c.CountryID }
The code above returns
.Country=Spain .CountryID = 1
.Country=Spain .CountryID = 1
How can I get the distinct values? The Countries query should contain only
.Country=Spain .CountryID = 1
I have a "result" which is DataTable and I like to get the x distinct values(City) and convert it back to DataTable how do I do this the code below gives me an error
Dim query = (From x In results.AsEnumerable()
Select (x.Field(Of String)("City"))).Distinct().CopyToDataTable()
so what I want is records of distinct cities I can get that but the problem I am having is converting it back to Datable.
Edited:I am using "where" in this statement and it does convert to Table(works fine) but not on "select"
Dim results = (From myRow In ds.Tables(1).AsEnumerable()
Where (myRow.Field(Of String)("xxxx") = xxxx)
Select myRow).Distinct().CopyToDataTable()
I have a DataTable that has several hundred rows.I want to get a row count of distinct values in a particular column.For example, I have a DataTable of Product Orders, but I want to get the number of unique Customers.
I was using this code, but I can't rely on it because my binding source is filtered from time to time.If my binding source has filtered out all rows datatable.DefaultView returns 0 rows.
I have a datatable which has been dynamically generated from FoxPro tables using a UNION Select statement. e.g.SELECT * FROM x UNION SELECT * FROM y UNION SELECT * FROM Z ORDER By v_alue1This produces a datatable with about 100 rows, each containing many fields, one of which is c_olor. From this datatable, I would like to select the distinct colors and then output in a dropdown.I have a public class Color which just has one property which I can then use as the DataTextField and DataValueField for the dropdownlist
Public Class Color
Private _c_olor As String
Public Property c_olor() As String
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Is it possible to select distinct values from a DataTable?
View 5 RepliesI f I have 1 combobox then my SQL query will be:
Dim objConnection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source = C:DB.mdb;Jet OLEDB:Database Password=Pass1;")
Dim objdataadapter As New OleDbDataAdapter("SELECT DISTINCT LOCATION FROM Table", objConnection)
I think my question is discriptive, or as Microsoft in the Documentation for Data Grid the question is, How do I have a combo box column display a sub set of data based upon the value of a different combo box column?
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MY TABLE
sample comment1
sample comment2
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if sample column value is the same, i want all comments value to be concatenated
do while dr.read
listbox1.items.add(dr.getstring(0))
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I load a list from a database like the example below. The class has more properties that the database table holds so when I load the list from the DB, there are Null values for certain properties of each item in the list. When I try List = List.Distinct.ToList, it never works (when null values are present).
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