I have a listbox which is populated from a sql table. I need to select unique month values from the dates in this listbox.
Dates are, for example:
21/09/2010
22/09/2010
21/07/2010
09/06/2010
I need to extract september, june and july only from the above, sort them and display them in a another listbox.
I'm using the datagridview. This is the sample data:
[Code]....
How do I parse through the grid to rename the duplicate values in a particular column (in this example it's the l_name field) into such a format?
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I have a question here.. pls kindly advise.I need to design a simple form that allow user to choose the value from Listbox A to Listbox B. For example, in Listbox A, have value A, value B and value C, then user can choose (or highlight value B and value C) and copy into the listbox B.
May i know how can i do this in vb.net? Any reference link?
Unique constraint - these columns currently doesn't have unique values..?? I have created Unique Constraint with 3 columns. My code works perfectly but once - two users @ same time entered same data and somehow it saved in DB; after that incident. This UniqueConstraint gives me error - These columns currently doesn't have unique values. How can I check if user enters this kind of entry or how can I restrict the Entry?
View 2 RepliesWe have a listbox in our MVC View and the user has the ability to highlight multiple values. I'd like to be able to save those selected values(if possible?) as a comma delimited cell value in our '08 SQL Database.
The image below shows what I am attempting to explain. Note the selection in the LISTBOX
This is where we save the passed in values from the Positionnumber DDL (Listbox w/ mulitple highlights).
> <HttpPost()>
> Function Edit(wsmonitor As WSMonitor, ByVal vbpositionnumberDDL As Integer, ByVal PassedCounty As Integer, ByVal
> MonitorTypeDDL As String) As ActionResult
[Code]....
I had set the multiselect option to true for listbox.Let me know how to move the list items up and down with this option.
View 2 RepliesI'm trying to make an aplication in wich you'll use the textbox to select an item form the listbox If the listbox has:
[Code]...
How do you input binded Radio button if checked values "String" to the data base using query Like if check radio button Male the gender in the database will be "Male" And female if otherwise the ,database column is string in my db and my dataset is radio button the inputted record should have male or female in gender column. I'm confused also with date time picker in vb and it is date/time format in database column.
View 1 RepliesI need to find a method of looping through a listbox and retrieving the index number and values - quite straightforward in asp, but turning out to be something of a nightmare in winforms!Here is the scenario - The user can add values in a textbox, that are in turn added to a DataTable that gives it a unique ID and a row number, this is then bound to the listbox. The user can then move the items up or down the list by adjusting the row number in the datatable and rebinding to the listbox..
The problem that I am hitting is when the user needs to delete an item -the first part is easy - delete from the DataTable and rebind to the listbox. The bit where I hit the proverbial brick wall is needing to loop through the listbox rows and getting both the index number and the ValueMember - that way I can change the row numbers in the DataTable based on the index number against the ID number.
is there a way to filter out unique values in a dataview or an array? I currently filter a dataview as such: [code] So now I have a dataview filtering the table, but can I further filter this data to find the unique instances of an item in this table? I eventually have to pass a portion of this table to an array, so if there is a way to find unique values in an array, I can use that.
View 1 Repliesis there a way to filter out unique values in a dataview or an array? I currently filter a dataview as such:
TxtString = "Name = '" & TxtName & "'AND EmpID = '" & EmpID & "'"
dv.Table = dsTestTable.Tables("TestTable")
dv = New DataView(dsTestTable.Tables(0), TxtString, "", DataViewRowState.CurrentRows
So now I have a dataview filtering the table, but can I further filter this data to find the unique instances of an item in this table? I eventually have to pass a portion of this table to an array, so if there is a way to find unique values in an array, I can use that.
how to fix it : These columns don't currently have unique values.
What should i do with my database. I'm using VB.net 2005 and SQL
I am trying to store 5 values and an associated unique key. I need to search for this key and update the 5 associated values. I'm guessing I would use an object as the value but how do I get the values out from the object?
View 19 RepliesI am using a DataGridView that has a filtered dataset and I like to validate a column in a new or changed row via a sub in the partial dataset class so that I can set the errorprovider to an error if the entered value isn't unique.I started out to set the field in SQL server with a unique key and then catch the sqlerror on the form. But data validation is best practice to do in the partial dataset class so I am trying to do it for this particular problem aswell. But after spending a lot of time I am stuck and wonder if it is even possible to do this particular validation in the partial class?
View 9 RepliesI want to add only unique items into the list box.I am using lstListBox.FindStringExact(strKey) it works perfectly. But I have large number of strings and it is taking too much time. It also make the CPU uses 100%.
View 5 RepliesI am using XtraGrid in my application. Now, I want to display only Unique values for particular column when user will click filter button. I want to display this list check box items initially all checked. Also I want the information that what items user has selected/deselected from from checked list box.
View 1 RepliesI need to create an array, then iterate through a string, adding the string value to the array only is it does not already exist, to produce an array of unique values. The issue I am having is with the array.length operation - on a array that is nothing I am unable to retrieve the array length (0), as such I am unable to redimensionalise the array to be array length (must be array length as arrays are indexed from 0), providing me the ability to add the new value to the array and then continue the loop until all values have been checked to see if they exist within the array (using contains) and the value contain only unique values..
View 2 RepliesBasically i have a list(of TransRecord)
vb Public Class TransRecord
Public TableName As String
Public PKs As String
[CODE]...
And want to create a linq filter to select only unique records for TableName + PKs (group by) ... but want it to select only the record with the highest ID for this group by.
Is there a way to get a subset of Unique values in column(1) of a DataView?
View 6 RepliesI am trying to populate an array with all the unique values in a string, to prevent me ReDim'ing an array every time I find a value that not already contained in the array I am trying to create (consumes alot of time), I am trying to get the unique values first so I only have to ReDim once and after that I can simply iterate through the string and the array I have will be the correct size for the unique values I aquire (I am using this...)
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I'm trying to make a method that can get unique values from a specified column of a DataTable. The problem is that the column may be string, integer, etc. I'm not sure what type of variable the (Of T) is.
Private Sub GetColumnUnique(ByVal dbTable As DataTable, ByVal ColumnNumber As Integer, ByVal ColumnType As ???)
Dim results As List(ColumnType) = (From item In dbTable.AsEnumerable Select item.Field(ColumnType)(ColumnNumber)).Distinct.ToList
End Sub
Is there any way to set a column to accept only unique values?(Via Table Definition)
View 2 RepliesI'm using MySQL to store some numbers. One of the columns in the database is defined as unique, but it does allow multiple NULL-values. That is exactly how I want it.ut when I'm trying to load the data into my strongly typed DataSet, I get a error saying that a constraint fails... I do understand why that happens (several rows with NULL-values in a unique column), but is it a way to keep a DataColumn in vb.net unique, but still allow several rows with NULL-values like in MySQL?
View 2 RepliesI'm using an Infragistics UltraWinGrid with a column of drop-down boxes. I don't want the user to be able to select the same value for multiple rows in that column. Is there a simple (or heck, I'd settle for advanced) way to do this? I'm using VB.NET
-EDIT-
I tried setting a filter on the data source for the drop-down box. But when I did that, the values in the other boxes in that column started disappearing (not the values themselves, but the descriptions that they were supposed to represent, so instead of reading "Information", it just said "1"). All of the cells in a column refer to the same combo box, so if you filter out a value from the data source for one of them, you filter it out for all of them. I'm currently trying to catch a CellChange event and check against all other currently-used values. If it was already used, I would put up a message saying as much and revert back to the old value. However, the value comes back as the previously-saved one, so... not helpful. About to see if I can use the "text" property.
How can I query a DataTable to find all of the unique values in a column? SQL has the 'unique' or 'distinct' keywords, but I dont know how to do this against a DataTable.
View 6 RepliesI am having so trouble with the ToUpper() procedure with strings. I am using LINQ to find unique values in a list of objects. In that whole process I set the values to compare to all lowercase in order to get a proper list. My goal is to populate a dropdown list with the values. I'm attempting to set the first letter of of the string to uppercase and keep the rest lowercase however the toUpper() procedure is not working?
Private Function FixCase(ByVal strIn) As String
Dim strOutput As String
Dim intStringLength As Integer = strIn.Length - 1
strOutput = strIn.Substring(0, 1)
[code].....
I have a List (Of Type) which contains many instances of a class with three properties, IPAddress, AlertDate and AlertTime.There can be many duplicates of IPAddress in this list :-
[code]...
I need to be able to pull out just the latest (by date and time) entry in the list for each unique IPAddress. Is there any simple way of doing this?
The problem that I'm having is that when I try to select a different date, the text doesn't go away. That may make no sence, but let me tell y'all what I've done.
1: Created a GroupBox
2: Put a DateTimePicker in the GroupBox
3: Put TextBoxs in the GroupBox
4: Changed the DateTimePicker to look like this:
A)Checked - False
B)Allow Drop - True
I thought that if I changed that, then the text in the text box would go to that specific date. It didn't do that, it just stays the same. What I'm trying to do is enter text in say 3/7/11 and when I choose date 6/12/12 it will display blank text boxes for me to enter something different.
I know how to do this in C#, but my dev team doesn't use C#...here is the answer in C#:How do I do this in VB?Essentially, if I knew how to write lambda expressions in VB, I would be set, but the materials I hav
View 2 RepliesIs it possible to select an item in one listbox and then display the data of another listbox with the same indexed position? I am planning a project and this is something I would like to attempt but I haven't figured out how to do it.[code..]
I tried doing the above code but instead of displaying the listbox text the message box just returned false.