I am creating an login page connected to a database. I am using access ODB. the problem is, if the user makes an wrong input, and the invalid data message box appeared, when typing the data again, and press ok, the following exeption occured:Not allowed to change the 'ConnectionString' property. The connection's current state is open.[code]
View 3 RepliesI've looked at a lot of posts on different forums where others have received the same error. Most say they were not referencing the connectionstring from the web.config file correctly, or they were trying to open the connection before setting the connectionstring. Well, if that were the case for me, then how does it work on two different systems, but not on the third? It works on my development PC and on the development server, but not in the production environment. The difference is the web and DB server are separate physical servers in my production environment and on a single server for development. My setup, error message and code will be listed below.
I can simulate the error on my PC if I rename the connection string in either section of the web.config file (appsettings, connectionstrings) to something else. You will see how I have tested both below.
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I have a web application that works perfectly on my local machine but not once Ive uploaded to the hosting server I get:
Server Error in '/' Application.
The ConnectionString property has not been initialized.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: The ConnectionString property has not been initialized......
I have a web application that works perfectly on my local machine but not once Ive uploaded to the hosting server i get:Server Error in '/' Application.The ConnectionString property has not been initialized.Description: An unhandled exception occurred during the execution of the current web request.review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: The ConnectionString property has not been initialized.Source Error:Line 423:Dim conn As New SqlConnection(connstring)
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i get error " the connection string property has not been initialized" while inserting. am using MS access as database.
View 4 RepliesI have used this piece of code for connecting to the database..It is showing error like The ConnectionString property has not been initialized.
Dim sConnString As String = "user id=" + sUserID + ";password=" + sPwd + ";initial catalog=" + sDatabase + ";Connect Timeout = 30" + ";Pooling=true;Max Pool Size=" + MaxPoolSize + ";Min Pool Size=" + MinPoolSize + ";"
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when i got to ADODC and try to go to connectionString in the properties of ADODC, the ConnectionString Dialog Box will not open when i click on it its wants me to type some kind of text. However on tutorial it clearly states that a dialog box should open up.
View 5 RepliesI know below code causes an error since "Property 'AAConnectionString ' is 'ReadOnly". What other choice do I have to assign a value for a user ID or a password with a value of textbox by coding?
My.Settings.AAConnectionString = "Data Source=bb.allgood.com;Initial Catalog=aadb; Persist Security Info=True;User ID=aa123;Password=aa123"
I create project in my pc with vb.net and sql database when i tried to run this project to another pc there is error occurred that the connectionstring has not been initialized. I really troubled this from last one week to solve the problem. how to change the connectionstring on client pc at runtime or any other way to create a connectionstring that has auto detect in any pc where the program is installed.
View 5 Replieshow to traverse all TableAdapter in xsd file?
I want to change default connectionstring of all TableAdapter objects in xsd at beginning of application,
I inherits textbox Control and I added some new properties to it .one of these properties value i want it to change it's value in desgin time when i change Name property of the new textbox
Public Class NewTextBox
Inherits TextBox
Private _txtSubName As String = String.Empty
That is the property for set or get SubstringName of Textbox
Public Property SubName() As String
Get
Return _txtSubName[code].....
that's the property i want to change it's value when i change Name property of the control.i tried to overrides Name property but it's not overridable also i trieds to overloads it but it doesn't work in desgin time.Here is something i tried but it's wronge.
Private _txtName As String = ""
Public Overloads Property Name() As String
Get[code]......
Dim Current As String
Current = Directory.GetCurrentDirectory()
con.ConnectionString = "PROVIDER = Microsoft.Jet.OLEDB.4.0;Data Source = " & Current & "SchoolMaticsDatabase.mdb"
con.Open()
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If tab index is changed the sub TabSelect() is called also. One other thing is that the program checks the day of the week and correctly displays the tab corresponding to that day. On Monday this code was working fine, as soon as it hit Tuesday this error cropped up.
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
I'm working on a simple base form in which all the other forms in the project will inherit. This base form only adds 5 properties (at the moment) dealing with painting a gradient background. The problem I'm facing right now is when I change a property on Form1 (the test form) and click run it doesn't show that change. I also checked the .designer.vb file and when I make a change it's not added to the code behind file, I'm at a loss right now to why.
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I want to click on the button, then change the itself position
the visual studio prompt me that is a public property, and the type is double. Why I cannot change the value? And it does not provide any method let me change the top property, so how I can change the property?
<Button Content="Button" Grid.Column="1" Height="23" HorizontalAlignment="Left" Margin="0,0,0,0" Name="Button1" VerticalAlignment="Top" Width="75" Grid.Row="1" />
MsgBox(Button1.Margin.Top)
Button1.Margin.Top = 10
I have a qeustion where i made a function that changes the property value of an object. the objects + alias are stored in an array (Objects()) , if the var (NewValue) has a value then it checks the property type and converts the Newvalue and inputs it.
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Want to change a property of a user in Active Directory programatically. I know I need to use DirectoryServices but I keep getting referral errors.
1. I want to connect to the directory an get the property first.
2. I will then use a evaluative expression to find out if step 3 is necessary 3. Want to change ths property
However, I want to run this from client machines so they won't have permission to modify the schema so I created a new users, is it possible to authenticate with one user and change another's?
Tutorials don't seem to show specification of the user the are changing the context user.
Using a plugin architecture, i created a Form Class that holds the Mdi Form. it has menustrip, toolstrip and statusstrip.
child forms are created as class and are loaded into the Mdi Form at runtime.
using interface, i was able to execute subs and functions of a child in the Mdi Form and vice versa.
now i need to change property values.. to be exact, i need to change the enabled property of the toolstrip buttons depending on which child form is activated using the form_activated event of the child form.
the problem i now have is how to change the property of the toolstrip item in the Mdi Form.. should i be using interface on this as well by creating subs in the interface and have the Mdi Form implement this interface?
is it possible to make this:
TextBox1.Enabled = False
TextBox2.Enabled = False
TextBox3.Enabled = False
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I want to give the user the ability to modify the font characteristics of a textbox on a form, using buttons. In the button click_event, I can successfully have the user change the font color to red directly:
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(using VB.Net 2008) I'm inheriting from a class, and overriding one of the properties. However, the original property has public get & set, whereas I want to make it read-only in my derived class, because the property in my derived class is already determined by other factors. But it appears I can't change the access level of any overridden method. Is this possible?
The closest analogy I came up with is suppose you have a Person class, with a get/set Address property. Now suppose you inherit Child from Person, and Child will have a new Parent property. Say you want the Child's Address property to be readonly, because it will simply return the address of Parent. Even if you can override the Address property, you can't make the Set non-public. The best I can do is make it throw an exception but that's obviously misleading during design time.
I am inheriting my own DataGridView (say MyDataGridView) from the standard DataGridView control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows, AllowUserToDeleteRows, AllowUserToResizeRows properties should have the default values of False; so that when I drag MyDataGridView into a form in the IDE, the default values shown in the properties grid should be False. Later on, if I want to change them to True from the grid, they will be set accordingly.
View 1 RepliesI want to change PrintPreviewControl 's property in run time.
for example change paper size to A4?
or change land scape ?
On form1 I put a picturebox from the toolbox.[code]Is it possible to set picturebox.visible=true of the inherited picturebox?
View 1 RepliesI have the following code, and I want it to act as a stopwatch.
Dim spn As New TimeSpan(0, 0, 0)
Private Sub elapsedtime_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles elapsedtime.Tick
spn = spn.Add(New TimeSpan(0, 0, 1))
Label6.Text = String.Format("{1}:{2}", spn.Hours, spn.Minutes, spn.Seconds)
End Sub
However, when the "stopwatch" ticks, the time is shown like this - 0:3, 2:9, etc. How can I change it so that when the seconds are in the single digits, it shows the time like a normal clock (4:05, 2:09, etc.)?
How can I change the locked property of the GroupBOX and Panel?
View 16 RepliesThis relates to vb.net on vs2008 I have a form (in actual fact many forms) in which the fields are bound to the public properties of class I have created. For example let say it is a customer class object oCustomer of type clsCustomer.
In the Set section of property declaration I use the NotifyPropertyChanged("propertyname") command like this
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I am trying to allow changes to our database through a timecard program. We use and Image database and I am using VS 2008. I am getting the error: (MDMDA) Unable to change property. The trouble shooting tip tell me "check the error code property of the exception to determine the HRESULT returned by the COM object." The error line is in bold.
If Not Trim(frmMantime.txtFunc1.Text) = "" And Not frmMantime.txtRec1.Text = "" Then
'Update Record
lngRecordNumber = frmMantime.txtRec1.Text
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How do I transfer the value of a variable and place it into the text property of an object on form load?
View 2 RepliesI have a Windows Form that contains a DataGridView. The DataGridView ReadOnly property is set to TRUE. The DataGridView as 3 columns. I would like to make the cells edible (ReadOnly=False) when the RowHeader is clicked. I thought that the following code would do it, but when I click on a RowHeader and then click in one of the cells in that row, the cell is still ReadOnly.
Private Sub dgvData_RowHeaderMouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles dgvData.RowHeaderMouseClick
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