the code bellow try to make the same effect that textbox1.readonly = True in an combobox...the code to do this are in a form class and because i never had work with class i don't knoe the way to call this class..
Option Strict Off
Public Class ComboBoxReadOnly
Inherits System.Windows.Forms.ComboBox
[Code].....
I'm making a program that allows me to drag and drop an image to a picture box. But I get this error when using the dragenter event. Here is the code:
e.AllowedEffect = DragDropEffects.All
What ever happened to the readonly method in the ComboBox? So i thought if MS did not have that option let me code around it. So i made a code herethat checks if the user inputs something else then what i want him to input.If it something else is found it returns the text back to "Hours(s)"But why do i get this error?
View 4 RepliesI have a project that I am working on which requires my datagridview to have certain columns set as readonly according to the user authentication results. But, almost every time I set readonly = true I get a nullreference exception.I have added ALL the datagridview events trying to see where I can handle this problem. The only event it calls into after I say readonly = "true" is my cell validation event. And that event always passes fine. It is after I hit f11 to continue past the "End Sub" of my validate event that I return to the calling code and all of the sudden have an exception too.
I've looked around and can't figure out how to debug this one so I am asking for help here. I have seen other bugs about scrolling content in columns and turning off scrollbars to fix random datagridview bugs but I dont know about this one. I can't find the same problem anywhere else yet.
-my admin timer elapses and I call a timeout routine which sets the grids back to readonly = true. One of my grids (one bound by datatable/bindingsource) almost always throws a nullreference when I set the readonly = true.
-when authenticating my user if their credentials pass I want to set the whole grid to readonly = false, and then individually set two columns to readonly = true so they cannot be modified while the rest of the grid is editable. I throw my nullreference here after my first individual column call to readonly = true.
I'm using multiple grids on my project, but the timeout nullreference exception seems to be tied directly to only one of my grids. In particular, this problem grid has the least complicated queries and barely any cell validation. I dont understand how it could be the cause of so much frustration. However, it seems that when changing readonly property on individual columns that both my main grids for my project will exhibit the same behaviors with the nullreference exception.
It's important to note that usually I can just drag the debugger back into the failure statement and it will actually succeed.By figuring this out I was able to set a flag if I wasn't able to change the status of the grid and recall it. Usually that fixes most things, but when it comes to doing the individual columns I cannot code my project to try/catch/recurse for each individual column.
I've got source and a test DB available if needed.I am not sure what is relevant out of my project to post? But I can offer some compensation via Paypal if someone on this board actually helps me fix my problem in a way that I can understand and troubleshoot for future projects. This is the last bit of functionality for my requirements and I have about 48 hours to get it bug free and working as designed or I will have to revert to some older spaghetti code and do a lot of this over.
I have a form called LogIn.vb which has no errors. After log-in, it opens the MainForm.vb which IsMDIContainer property is set to true. From the MainMenu, it opens a child form called Assure_Benefits.vb So far no problem up to this point. When Assure_Benefits.vb loads, it displays 2 DataGridViews with datasourses from my 2 tables in my database.
There is still no problem with the loading. Now, to show the difference between different user types, I only allow the admin to edit the DataGrid. SO I set the readonly property to true when UserType = "user".
I have no problem doing that. My problem is I want to add some codes besides the readonly being set to true and false but other codes are not executed and the program does not display any errors at all. i tried to add messageboxes on the if and else conditions to try if added codes will work but even the messagebox does not appear though the codes next to it are properly executed.
When my Assure_Benefits.vb loads I call for the subroutine below.
Private Sub SetControlProperties()
If LogIn.UserType = "admin" Then
MessageBox.Show("Yes") 'This line is not executed
[CODE]...
I can't seem to understand why the first code is not executed when the next codes works fine.
I need to give a user a drop down list of items to choose from, but I dont want them to be able to type in the combo box, any ideas?
[Code]...
is there anyway to make listbox1.item1=textbox1.text? or the first row of richtextbox1=textbox1.text?
View 1 RepliesI use lots of panels to hide controls and display groups of controls.
If sender Is BDVActive Or sender Is BDVCompleted Then
BDVCases.Visible = True
BDVCases.BringToFront()
[Code]...
What ever happened to the readonly method in the ComboBox? So i thought if MS did not have that option let me code around it. So i made a code here that checks if the user inputs something else then what i want him to input.If it something else is found it returns the text back to "Hours(s)"
View 2 RepliesHow do I make it to where you cannot type into a combobox, but you can choose items through the drop down? I tried Readonly, but it makes it so you can't type AND can't drop down select.
View 1 RepliesI have completed my project and i have one remaining thing to settle... I want to make the combobox not to be able to write yourself. for example there are 4 options ,"A","b", "c","d".If i type w in the combo all the project is ruined!i want not to be able to type at all to prevent this...Which property should i change?
View 5 Repliesi have an app that has many suggest append comboboxes in the style of just straight dropdown.
I also clear the text in all of these draopdowns via resettext() in a loop when my user clicks a 'New' button
is there any way to either A:
make the combobox read only (without selecting dropdownlist)
or B:
allow suggest append to fire on all keystrokes instead of only when it sees a match in the combobox....
example: combobox1 contains the following items:
- apples
- oranges
- bananas
as of right now, if my user types in "pears" it won't see any 'P' and won't suggest anything else or even drop down the combobox and allow "Pears" to be entered and because my app does processing only on the items in the list, "pears" then throws an exception....I'm trying to force them to choose only the items in the list and not be allowed to enter anything else while still enjoying the clean look of a resettext() on a combobox
i'm trying to make simple process killer... but i do not know how to make a selected item apper in textbox1
something like??
combobox1.item selected = textbox1.text
I know that
Public Incognito As Boolean
is a variable called "Incognito" that is class-wide that is a boolean.My question is that is there a form-wide variable form that can like communicate with different forms. So if a variable in form1 is "True" than, how can you make a variable in form2 turns to "True" too?
I use following codes to diplay data in combobox
str = "SELECT sno,name,city FROM employees"
cmd = New SqlClient.SqlCommand(str, con)
[CODE]..............
With ComboBox1
.DataSource = dt
[CODE].......
Table has three fields as sno,name,city Combobox displays name column and data in table is as
sno--name-----city
1-------a------london
2-------b------moscow
3-------c-------tehran
Supose combobox text=a then I want to display following corresponding data in textbox1 and textbox2
textbox1.text=1
textbox2.text=london
(the first row of data)
Is there any way of making controls that aren't textboxes into readonly controls? Specifically I have a date time picker (but I have the problem occasionally with other controls), that I want to make ReadOnly as opposed to disabled so that the user can see clearly what is in the control but cannot edit it. Making a control like this disabled makes it hard to read and furthermore, gives the impression to the user that they are to ignore the field, which defeats the object.
I'm sure a suggestion will also be to stick the information into a text box, however there are other date time picker controls that CAN be edited in the same window, and it would make life a lot easier if the layout of each was exactly the same.
When I use the code below, I can't get any (copy)effect as I drag things onto the picture box(img). Therefore, I can't dragdrop files. How can I make dragdrop event possible?
[Code]....
How to make a picture glow & blur even if the picture contains transparent color?
View 6 RepliesI'm trying to build an application to increase my understanding of visual basic. I may have set the bar too high for myself but it's the challenge that makes it fun right? Anyway, I'm trying to make a transition effect of a page turning. The application is a brewing database which looks like a book. I think the transition would make it look more professional. Dose anyone have on how I might be able to accomplish this? A basic example even would go a very long way.
View 5 RepliesUsing VB.NET in Visual Studio 2005, how do you disable or make readonly a particular tabpage?
View 1 RepliesI am making a program to save it to (.txt).I am making it using System.IO.So far, my program can save the file already.But, I don't know how to make it readonly programatically.
View 3 RepliesI am using a PropertyGrid control to edit my class properties and I am trying to set certain properties read-only depending on other property settings.This is the code of my class:
Imports System.ComponentModel
Imports System.Reflection
Public Class PropertyClass[code].....
This is the code I am using to edit the values:
Dim c As New PropertyClass
PropertyGrid1.SelectedObject = c
The problem is that when I set SomeProperty to True, nothing happens and when I then set it to False again it sets all properties Read-Only.
If TextBox1.Text.Contains = ("@") Then I need to make sure textbox1 contains a @. And its supposed to be a code like that.
View 14 RepliesHow I can make Mouseover Vista Effect(icons) for picturebox?
View 4 RepliesHow do I make Particle Effects and Effect Generation without Directx?
Effects I need
- Dust
- Fire
-Rain
-Thunder
- Fog
- Exsplosion
I am developing desktop application using vb.net and vs2008.I have a DropDownList that I don't want it interact with use when the info is locked. But if I disable it, it is greyed out and the text is not easy to read.Is there any way to make radiobutton like readonly textbox?I want text of the DropDownList looks black and itself is not clickable.The above shows a disabled DropDownList with greyed out text and a readonly textbox
View 3 Repliesi want to make checkbox as readonly not enable/disable.
View 1 RepliesIn button1 Keyup I want to be able to make textbox1 skip a line.How would i do this. I tryed
Private Sub button1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles button1.KeyUp
If e.KeyCode = Keys.Enter Then
textbox1.text = vbnewline
End If
End Sub
I would also want to know how to make it when I push the button2 it will undo the letter I just did
Private Sub button2_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles button2.KeyUp
If e.KeyCode = Keys.Back Then
textbox1.undo 'this will just undo the whole text I just did
End If
End Sub
I am in the making of creating a database desktop application using VB.NET. I want my UI to have similiarity the same as Microsoft Money. By this, now I want to make all my textbox to behave this way :
flat will have no border, or if it's still if the mouse hover on it, the border will get emphasized.That's all.I recognize that in TextButton, we have FlatAppearance, so we can tweak all Button to behave like this. But the same is not happened for TextField.
I have many textbox inside a group box so when radio button is clicked i want to make these controls readonly. Is it possible,and again on another radio button click again i want to make readonly false in vb.net.
View 1 Replies
