GridView - Hiding Unique Column From Users
Sep 30, 2010
My 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] .....
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Aug 15, 2011
For my user system, I require each user to have a unique id. The reading in and saving of the user data is all done, but now I'm focusing on adding new users. In my add user dialog, I have the information fields required to create a new user, one of which is the ID (which must be unique). For this I have created a function that I thought would always give a unique id but it does not. paste the code below:
Function getnextuserid()
Dim id As String
Dim unique As Boolean
[CODE]...
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Feb 26, 2010
I have a datagridview and once I populate the view with the data source I hide the columns that I do not need. For some reason the 1st column is not hiding. I have checked the column name and they match and the 2nd line executes fine hides the column for the EVENTID. I even did a messagebox.show( dgvTourOther.Columns("OTHERID").name) and it returned the correct name.
dgvTourOther.Columns("OTHERID").Visible = False
dgvTourOther.Columns("EVENTID").Visible = False
The values being passed are all strings. I do this on 3 other datagridviews ok but for somereason this gridview is acting different. I am going to try an rearrange the columns and see if that helps.
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Jul 1, 2009
am binding the datagridview with datatable, actually I am converting a dataview to datatble after applying the filter. After binding my datagridview, I am trying to hide the first column and I am getting an error "Index was out of range. Must be non-negative and less than the size of the collection.Parameter name: index"Below is my code. I have two rows and 22 columns. The first column name is IndexID and want to hide that column
Private Sub bindGrid(ByVal dv As DataView) Try Dim ChatsChild As New edsChildim dt As New DataTable dt =
[code].....
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Jun 1, 2012
I am stuck on hiding a column in listview. I want to hide the items in that column as well. I tried setting the width to 0 but the user can still size it out and see it. I heard there was a way of doing it by removing the column completely and all of its items and then they can be refreshed back into that column when need be.
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Mar 15, 2012
I know that .RowHeadersVisible = False will do this but it obviously also gets rid of all my column headings (which I want to keep). How do I get rid of the row selected column but preserve my column titles?
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Sep 30, 2010
Whenever a row is selected in my GridView, I want to take the ID field of my gridview's dataset and form a unique URL with it (use a ?id=1234 parameter). In the Page_Load event I have the following code:
TextBox1.Text = Request.Url.AbsoluteUri.ToString & "?id=" & _
GridView1.SelectedIndex.ToString & Environment.NewLine
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Apr 1, 2010
VB GridView control will not allow code in the vb code file to access a data column that has its visible property set to false. When it is set to true, the data column can be accessed with no problem. Any suggestions as to how to correct this? I have looked through the documentation, text books, and I have not found anything that gave me any clue as to what the problem could be. I thought that the property was just applied to the column, not that it would remove the column from being accessible.
[Code]...
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Jul 15, 2010
For 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]
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Mar 15, 2012
currently, 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?
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May 21, 2011
Is there a quick way to put unique value to column in a table? Assuming I want numeric values starting from 0.
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Nov 25, 2010
I 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]...
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Mar 31, 2009
Alright, 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.
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Jun 19, 2010
i 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?
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Oct 1, 2009
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.
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Jun 16, 2009
I'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]
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Jul 8, 2009
For 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.
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Feb 20, 2009
I'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.
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Jun 5, 2011
I 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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Dec 16, 2009
Is there a way to get a subset of Unique values in column(1) of a DataView?
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Jun 16, 2009
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
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Nov 30, 2009
Is there any way to set a column to accept only unique values?(Via Table Definition)
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Mar 21, 2012
I'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.
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May 7, 2010
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.
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Oct 27, 2011
After Filling a DataTable in GridView's DataSource . A column with check box Type appears but it created as read only column and I can't enable it or make it editable... even i tried .readonly = false and still can't be edited
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May 6, 2009
I have a DataGridview. The user has to pick an option in the datagridview. I am contemplating either putting a context menu in the DGV. I am assuming that I will fire my context menu on the Cell Enter event. However prior to that I need to draw the users attention to the column of interest.
I know I can hide all other columns but his is not userful as they need to be visible. I am also assuming that I can highlight the column in the form load event. Or I could use some sort of Call Out box in the form load event that draws the user to the column. Can you create a call out box from a context menu?
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Feb 13, 2012
I 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)
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Jan 10, 2009
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?
[Code]....
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Sep 23, 2010
do anyone know how to add a new column in gridview using vb.net syntax?the column that i want to add is not bind to any database unlike the other column in the same gridview.
i try to use GridView1.Columns.Add("Percentage")but it turn out to be error.the error said " Value of type 'String' cannot be converted to 'System.Web.UI.WebControls.DataControlField'"
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Mar 21, 2011
How 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].....
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