Error Column 'Item ID' Is Constrained To Be Unique
Jun 5, 2011I have this error, error Column 'Item ID' is constrained to be unique, what do I have to do to change it and the code
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Datagridview Error "System.Data.ConstraintException: Column 'Name' Is Constrained To Be Unique" Handling
Nov 13, 2009I have a datagridview that seems to be working fine until the user adds a name into the unique name column that already exists. I am getting this: System.Data.ConstraintException: Column 'Name' is constrained to be unique. Value 'test' is already present. where and how I capture this error and prevent the users from adding another name, case insensitive, to prevent this huge error from coming up?
View 3 RepliesDB/Reporting :: Column 'TYPE' Is Constrained To Be Unique?
Feb 20, 2009I'm using vb2005. I'm writing a little application which allows a person to type in a new value in a combobox (which I've bound to a field in a table) which can be updated to the database. I then refresh the dataAdapter by clearing it and re-filling it again when the user saves a new item. That part works fine. My problem occurs when the user selects a stationary item from the combobox. The first select works fine until they try to select another item. Then I get the following error: ConstraintException was unhandled: Column 'TYPE' is constrained to be unique. Value 'False' is already present.
View 2 RepliesBindingNavigator With DATAGRIDVIEW - Error: Column Name Is Unique
Jun 16, 2009I'm using vb.net on vb 2005, I create datagrid view that when i click search button on the main form. It will show datagrid view that I want and when i click OK to select any record, the selected record will show on the desire text box in the main form. The problem is the record i choose is record no. 5 of all 10 record but the Bindingnavigator tools bar show that it's the first record of all 10 and when I click Next record arrow, the error message show that the 'PK column name' is unique and the 'value of the PK from my selected record' is already exist. [Code]
View 1 RepliesColumn's Value Is Likely To Be Unique 90% Of Time
Jul 15, 2010For each loop through a DataSet, I need to store the values of 2 columns (we'll call them ColumnA and ColumnB) so that I can use them to search the same DataSet again later.The DataSet stores the results of a search and places the value of ColumnA into a ListBox as a new item.When the user clicks on this ListBox item, the application will loop through the DataSet again using the value of ColumnA and the value of ColumnB as criteria to identify the correct row in the DataSet to return.This would be a lot simpler if the value for ColumnA was unique every time, but a value will inevitably be repeated on occasion. That's where ColumnB comes in. This column's value is likely to be unique 90% of the time, and, given the nature of the information in the DataSet, if either column duplicates, the other won't.So I've thought of adding the values for ColumnA and ColumnB into a 2 dimensional dynamic array, but I'm doing something wrong apparently.[code]
View 3 RepliesKnow If The Table Column Is Unique?
Mar 15, 2012currently, what i want to do is, add a column in a table "default" during runtime. Well, I've got that covered already.
The problem is, the column names are actually taken from the users input through a textbox or drop down list and of course, if the same column is added already in the table, it generates an error since it has to be unique.
That is why i wonder if it is possible to know if a column already exists without viewing the form which contains the grid view of that table?
Put Unique Value To Column In A Table?
May 21, 2011Is there a quick way to put unique value to column in a table? Assuming I want numeric values starting from 0.
View 4 RepliesVS 2008 Get The First Unique Column?
Nov 25, 2010I have a matrix which is in a text file.
ABMS101848 T G
ABMS101848 C H
ABMS101848 A S
SDFR236176 D Q
SDFR236176 2 X
[Code]...
VS 2008 SQL - With A Unique Column?
Mar 31, 2009Alright, I have this Access Database. It has 6 Columns: ID | Class Name | Class Code | Class Room | Grade | Teacher
My ID is the Unique Column that I need to reference back too when Updating my other Fields so I get the correct field.How do I do this? Properly.I've been thinking of a method but I doubt it would work.First I would start off selecting all the ID's and then LOOP through all of them, and then rewrite them to to + 1 Each time I make a Delete, so Each Time it will be a consistent 1 2 3 4 5 6 7 8 9 10 .... etc... Then I can reference from that to my Combo Box Selected Index + 1 to get the Correct Row which corresponds with the Selected Item.Will this work? Or will I still need a Unique Fields that I reference back too.
VS 2008 : Get Unique Value Of A Column Of A Datagridview?
Jun 19, 2010i need to get only unique value of a column of a datagridview es:
COMLUMN
value1
value2
value3
[code]....
and get only:
value1, value2, value3, value4
how i can do this?? is possibile make a quaery into datagridview?
VS 2008 SQL - Update With A Unique Column?
Oct 1, 2009I have this Access Database. It has 6 Columns: ID | Class Name | Class Code | Class Room | Grade | Teacher My ID is the Unique Column that I need to reference back too when Updating my other Fields so I get the correct field. How do I do this? Properly.
I've been thinking of a method but I doubt it would work. First I would start off selecting all the ID's and then LOOP through all of them, and then rewrite them to to + 1 Each time I make a Delete, so Each Time it will be a consistent 1 2 3 4 5 6 7 8 9 10 .... etc... Then I can reference from that to my Combo Box Selected Index + 1 to get the Correct Row which corresponds with the Selected Item.
Create Unique Numbers And Insert Them In Column 'ID'
Jul 8, 2009For my database I need to create unique numbers and insert them in the column "ID". Can I add them via a SQL query? The numbers would simply be 0001 to whatever.I'm using the "Show Table Data" gui.
View 7 RepliesGet A Subset Of Unique Values In Column(1) Of A DataView?
Dec 16, 2009Is there a way to get a subset of Unique values in column(1) of a DataView?
View 6 RepliesGridView - Hiding Unique Column From Users
Sep 30, 2010My query returns 4 columns. One column is a unique identifier for the record. I'm trying to hide that column so the user doesn't see it. I'm going to add an edit button and hopefully I'll be able to allow the user to click on the record's edit button and edit only one of the remaining 3 columns and I expect I'll need that hidden value to do the update. I've got code below but it doesn't work. It gives me an exception, "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index ".
Dim MySqlCommand As New SqlCommand
MySqlCommand.Connection = MySqlConnection
MySqlCommand.CommandText = "SELECT ..................."
MySqlConnection.Open()
GridView1.DataSource = MySqlCommand.ExecuteReader
[Code] .....
VS 2008 - How To Get Unique Values From Specified Column Of DataTable
Jun 16, 2009I'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
VS 2008 : Set A Column To Accept Only Unique Values?
Nov 30, 2009Is there any way to set a column to accept only unique values?(Via Table Definition)
View 2 RepliesWay To Allow Only Unique Values In A Column Of An Infragistics UltraWinGrid?
Mar 21, 2012I'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.
Query A DataTable To Find All Of The Unique Values In A Column?
May 7, 2010How 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 RepliesResize Listview Column To Largest Width (column Header Or Item) C#
Jul 4, 2011I have been trying to find out how to resize listview column width to the largest widthor either column header or item in c#
[URL]
Get The Column Name From Column.ColumnName And The Value From Rows(0).Item(0)?
Jul 13, 2011I have a DataSet that contains 1 DataTable, and the DataTable contains only 1 row of data. I want to loop through all columns in that row and say:
Column name = column value
so for example if the column name is FAVORITE_FOOD and the value is pizza, I should display FAVORITE_FOOD = pizza I can get the column name from column.ColumnName and the value from Rows(0).Item(0), but for the life of me I can't put it all together in a simple loop.
Add Item Into Next Column When First Column Add To 5 Items?
Aug 1, 2009how can i add item into next column when my first column add to 5 items it will automatically move to next column and continue to add item in 2nd column.
View 15 RepliesDataGridView "An Item With The Same Key Has Already Been Added." While Using A Unique Index?
Oct 22, 2010I've looked around and can't seem to find a solution to my problem. I have an EventLog object which inherits DataGridView and has a public variable EventList which is a List(Of EventLogItem). EventLogItem has seven properties which describe the event, including Index which is set to EventList.Count each time an entry is added (so, it should be unique). Everything has worked just fine until I tried to add an entry from a serial port DataReceived event handler upon which I receive the following exception:An error occurred creating the form. See Exception.InnerException for details. The error is: An item with the same key has already been added.Clicking 'View Details' and expanding the InnerException yields no more information. Here is some relevant code:
[code]...
Create A Fixed-length Unique String From Another Unique Numerical Value That Is Too Long?
Feb 13, 2012I am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)
View 2 Replies[2008] Datagridview - Duplicate Cell Values [non-unique To Unique By Appending]
Jan 10, 2009I'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?
[Code]....
VS 2008 - Code Error On Tax Calculating Program - User Enters The Item Name And Amount Of The Item Purchased
Feb 9, 2010So i've to write this program whose purpose it this:
Purpose: The user enters the item name and amount of the item purchased. The program calculates the tax for the item and the final total, and then displays these values. Tax on all items will be 7.75%.
And so far i've this code but it's not working:
' Program: Cash Register
' Author: Nidhi Shah
' Date: February 2, 2010
' Purpose: The Cash Register Window application will
' computer the tax and the final cost of a
' purchased item.
Option Strict On
Public Class frmCashRegister
' Tax per item - used in multiple procedures
Const _cdecTaxPerItem As Decimal = 0.0775D
[CODE]...
Error: #1066 - Not Unique Table/alias: 'Messages'
Feb 1, 2011im trying to join two tables together, (this messaging system) and im having trouble with the query.
Select Message_ID, Firstname, Surname , Subject , Message FROM messages, guardian_users INNER JOIN messages ON guardian_users.User_ID = messages.Sender_ID WHERE messages.receiver_ID = 3
and im getting this error: #1066 - Not unique table/alias: 'Messages' (joining tables Messages and guardian_users)
Asp.net - Unique Number For Unique Visitor On Button Click?
Mar 21, 2011How generate the unique no. 1,2,3 and so on .... on button click of each new user ..
the code mentioned below is a readwrite coding in vb.net ...
but the problem is it generate the same id for different users on button click event... but i want the no. of times button clicked the new ids will be generated
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim FILE_NAME As String = Server.MapPath("counts.vbi")
[Code].....
Unique Constraint - Columns Currently Not Have Unique Values?
May 8, 2011Unique 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 RepliesCheck Box Error Message : Cannot Set Column,The Value Violates The MaxLength Limit Of This Column
Jan 30, 2010I am trying to placed several check boxes (15) in a group box or on a form. I receive the following error message in Visual Studio:
Cannot set column, "The value violates the MaxLength limit of this column".
Add Item Into Certain Column?
Apr 28, 20121. How to add item into certain column??Let say i want add item into column 2.
ListView1.Items(i).SubItems(2)?
2. I want to add an image into listview n view in detail style.[code]...