Item Cannot Be Added To A Read-only Or Fixed-size List?

Jun 11, 2010

I have two datagridviews in my app. They're related. When there is no record in the parent datagridview, I select the "New Row" and then press the Add Button in the child datagridview's bindingnavigator. Then I get that exception:

InvalidOperationException: Item cannot be added to a read-only or fixed-size list.

I know why this happens.When I add new record to child datagridview, parent datagridview's new row loses focus and then delete row. So this error occures.How do I prevent my program from this exception. Remember, it's only occures if there is no record in the parent datagridview.

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Structures - Fixed Size (Overall Size And Item Size)

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Now all went well about from using the structure correctly. The working of the structure was perfect. How ever i missed Two important issues. The structure needed a fixed size of 10 items (9 in programming terms starting from 0) And also out of the 5 items allowed to be chosen as one of the member types for the structure a limit of 5 items of that particular type.

[Code]...

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I'm writing code some that is supposed to be creating a list of objects pulled from a data base. The list returned has every item containing the value of the last one added. When I debug the code is VS2008 I can see each time that the list.add is performed every other item in the list being changed to the one just added. Here is the code I running. The line containing ListAKAs.Add(itemAKA) is the one where the entire list of objects is changed to be identical to the one just added.[code]....

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[Code]...

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[Code]....

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Private Sub XamMenuItem_DeleteClick(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim selectedRowCount As Integer = Grid.SelectionSettings.SelectedRows.Count
If (Grid.Rows.Count >= selectedRowCount) Then
While Grid.SelectionSettings.SelectedRows.Count > 0

[Code]...

above code throws me a "Collection was of a fixed size".

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Getting The Fixed Size Control?

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How To Set The Fixed Column Size Of A Grid View

Apr 14, 2010

I have a gridview which automatically adjusts with the dataset but i want to adjust he size a bit

can any one tell me how to set the column size to a fixed size

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Rectangular Arrays Of Fixed Size At Runtime

Apr 20, 2011

In languages like C++ and Java, it is possible to declare an array of an arbitrary size and then give it a specific size later in the code.

[Code]....

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Create And Initialize An Array Of Structures Of A Fixed Size?

Mar 6, 2012

I am trying to create and initialize an array of structures of a fixed size. Each struct will be populated when a button is clicked. Here is an example of my struct:

public structure buttonStruct
dim x() as Boolean
dim y() as Boolean

[code]....

In my form_load function I am declaring the array of structs and:

Dim BtnStruct(15) As ButtonStruct
BtnStruct(0).Initialize()

[code]....

Whenever a specific button is clicked, I am trying to collect data and store it in the respective struct and so for example, if button 1 is clicked then I will store the data associated with button 1 into BtnStruct(0). The position of the button is stored in a public variable called BtnNum. If I attempt to store information in the struct inside another function as follows, I receive an error

BtnStruct(BtnNum).x(pos - 1) = temp "btnstruct is not declared. it may not be inaccessible due to its protection level"

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VS 2008 Stop Textbox And Datagridview Cell From Scrolling (fixed Size)

Aug 16, 2011

I need to limit a Textbox and DataGridView to only enter text in the fixed size of the cell/textbox on the screen. So I have limited the cell/textbox so user can not change it size. Both allow multiline and wordwrap. cell/textbox is sized to accept 5 lines of data (wordwrap or enters) This is like an online form.So the text enter will be printed so I can not allow scrolling in the cell/textbox.

How can I stop the scrolling of the text inside the cell/textbox.

Also : if the user Paste into the cell/textbox how to truncate text if larger than display area.

sample settings:
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[Code].....

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I've a text file which has some data written. Records have Starting character as "#2" and Ending character as "#3" in ASCII respectively and the file includes series of records, but not written as Line by Line. The difficulty I'm having is, to how to transfer those data's into a database. The File comes a 7mb file and looping character by character then noting down the Record Starting Character and Record ending Character, and finally substring them is not feasible as it take more time and makes the computer slower. I would like to know is there any easy way to transfer them?

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qwerty 12345 asdfg
asd 455 hfgdf
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[code].....

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I'm new to VB in Visual Studio 2008 and am just trying out some simple test.I just want to change the Font & Boldness of some text but get the following errorProperty 'Size' is Read onlyI have been browsing the forums and it seems that changing the font size etc isn't as simple as

TextBox.Font.Size = 12
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Is this true, and if so what do I need to do

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4. If this file hasn't already been seen elsewhere on the disk, copy it to a central directory.

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Nov 28, 2011

I have been a VB user for quite a long time starting from dos-basic types. But only now I encountered with a quite a newb problem :) I tried to search MSDN for it for about a few days and at the end I have to ask this question here because I could not find anything about it.

From time to time I use functions or subs where one parameter is a word from a defined list.

E.g.

private function my_function(byval THE_PARAM as string) as ..........

where THE_PARAM could be "work", "home", "bus", etc. 5 words all together.

How can I define a function so that when I use it on the text of the program I had a hint not just like "THE_PARAM is a string", but I had a choice of those pre-defined words, so I could choose a word from that list.

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Aug 25, 2010

I am learning to use TextFieldParser to read a fixed width text data file. It works great. I copied code below. Question: How to stop at the end of each line because I need to add some code?

Using tf As New TextFieldParser(fileName)
tf.TextFieldType = FileIO.FieldType.FixedWidth
tf.SetFieldWidths(60, 30, 20) //three columns

[Code].....

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Public Class Form1

Private Sub lstData_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstData.SelectedIndexChanged

'Declare Variables

[CODE]...

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Public Class frmForm
Dim List() As String = {""}
Dim count As Integer

[code]....

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Having some issues with creating a simple control in vb.net.

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When i then build it and add this control to a form. Some of the edges are cut off and it isn't anchored the way it was in the control.[url]...

as you can see in the second image the control has lost its white border at the right and bottom.

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Asp.net - Error: An Item With The Same Key Has Already Been Added

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Public Enum ERight
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etc...

[CODE]......................

This below sub, on rights.add, sometimes throws this error: An item with the same key has already been added.

Private Shared rights As Dictionary(Of ws_garuda.EUserType, List(Of ERight)) = Nothing

Private Sub initRoles()
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[CODE]..................

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