VS 2008 TextBox DataBindings - Default Null Value Doesn't Show Up
Jun 29, 2010
I have a form that has several controls, most of them are textboxs. All controls are binded to a bindingsource. The controls that always have values, they are displayed correctly, but the others ones that have null values in the data source, the default null value doesn't show up. This problem it's driving me crazy... There must be something that i'm missing. Some of the code that i had used with no luck:
[Code]...
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Jul 29, 2009
If i didn't place any date in the textbox ,system is capturing 1/1/1900 by default insted of Null.How can i get rid of this.
[Code]...
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Aug 26, 2011
I have the following
If Trim(txtConfirmationDate.Text) <> "" Then
sqlinsert2.Parameters.AddWithValue("@CONFIRMDATE", CDate(txtConfirmationDate.Text))
Else
sqlinsert2.Parameters.AddWithValue("@CONFIRMDATE", VB.vbNull)
End If
Unfortunately, it writes "01/01/1900" to the database. How do I get it to just leave the field as NULL?
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Mar 16, 2009
I'm try to making a text box showing a date, this what i've done
[code]...
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Feb 28, 2011
I have some textboxes bound to a bindingsource and bindingnavigator.
I want to detect when the values have changed and prompt the users to confrim if they want to update.
When the form is first initalised and when then binding navigator moves to the next record the text_changed event fires on textbox where I have a boolean to determine if things have changed.
Is there a way to set my boolean only when valid data changes have occured or a better way to detect if things have changed
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Feb 4, 2012
When i create a windows form in VB, i want to have a picture box on my form, but in design view it shows the box, but when you run the program it doesn't show it. I want it to show the box so when you run the program it will show the box and you can click on the box and you can add the photo you want on your form and then print the form or save it.
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Feb 11, 2011
I am using the DownloadDataAysnc. But the ProgressChanged event doesn't show progress until after the data has been downloaded.Even when I try and download a data which is contained in a big file. The programs remains responsive so I know it is doing something.However, it is when the progress has completed that the progressChanged event fires.I known this as the progressChanged and the DownloadDataCompleted fire immediately after each other. However, they should be a pause as the file is quite big.This is the code snippet I am currently using. And the output below
Results:
Progress changed Version userstate: [ Version1 ]
progressBar1.Value [ 100 ]
[code].....
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Oct 25, 2009
I am trying to setup a treeview control to display all drives and folders on the PC. So far I can display all drives and folders but the images will not show except rarely. I am using an imagelist with 4 images (index 0-3). The code below is used to load the drives in the treeview control. I have tried using every type of image possible from bmp to png and nothing. I have tried the Appllication.EnableVisualStyles() which I now know isn't needed in vs 2008. I am also having problems with a picturebox in another form that shows nothing but a shadow of the image. I suspect this may be a setting somewhere maybe in vs 2008 but am not able to find one.
Treeview
Dim drive As Integer = 0, dir As Integer = 0
For drive = 0 To oDrives.Length - 1
[code]....
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Jan 19, 2012
I have a dictionary (literally) database file in Access: its Fields are Headword (string) and Definition (Memo, it's in Rich Text). The Rich text looks fine in Access, but when I connect a Visual Basic (2008) Datagridview control to the database, the text looks like HTML, not RTF, and when I try to copy a specified "definition" into a RichtextBox, I get the same weird symbols, not RTF. One attached snapshot is how a record looks in Access, the other in a VB 2008 form with a datagridview control and an attempt to paste contents into a RichTextBox.
How can I get that same "look" from the RTF in the original Access file? I'm only recently moving from VB6; not a professional
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Jan 13, 2011
Private Declare Function GetAsyncKeyState Lib "user32" Alias "GetAsyncKeyState" (ByVal vKey As System.Windows.Forms.Keys) As Short
[Code]...
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Dec 16, 2009
I have a couple of textboxes whose databinding's text is set and also readonly is true and visible is false. but when I try to read their values they are all null unless I turn their visibilty to true. The same method is also needed to add a new row to the table (when using bindingsource1.addnew()).
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Aug 4, 2009
I want all binded controls in a form or a user control have the Data Source Update Mode to OnPropertyChanged (by default they are in OnValidation).I can do that for each control in designer mode and in the DataBindings, under Advanced, change the Data Source Update Mode to OnPropertyChanged but I want to do that once for all controls.
All my controls are in a big user control, so I put before InitializeComponent() :
Me.DataBindings.DefaultDataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged
It is not good, my controls are still in OnValidation mode (instead I force the
[code].....
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Apr 6, 2009
I have been developing a database management program which is quite simple so far, with navigational controls, ability to delete record, datagrid, etc.
It uses databound textboxes, but when I modify the content of them it does not update the database. Same applies when I add a new record and fill in the textboxes. What do I need to do?
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Feb 22, 2012
I wanna know a thing.I wanna know how to move into the different regs of the form (using databindings), just focusing the ID textbox and selecting ALT + => to go to right, ALT + <= to go to left, ALT + UPbutton to go to next and ALT + DOWNbutton to go behind.
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Jan 16, 2009
I am porting a college project made in VB6 to VB.NET, which I am quite new to. I'm finding data bindings a little more frustrating than the ADO controls VB6 had. Here is an example of RecordCount being used in the old code, from the login screen:
Private Sub cmdLogon_Click()
If txtID.Text = "" And txtPassword.Text = "" Then
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Jun 24, 2011
how to change calender default value to null?
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Sep 22, 2010
I think this is a pretty basic question, but I just want to clarify. If I have a variable with a null value, and pass it as a parameter that is optional, will the parameter get the null value, or the default value?
dim str As String = "foo"
dim obj As Object
//call 1
[code].....
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Aug 4, 2011
How can you set a function optional argument to null? For example, I want to set the optional argument intCode equal to Null. These arguments are used to send to a stored procedure as parameters.
Public Function pubfnc_SetCommentCode(ByVal strFieldName As String, ByVal lngResultID As Int32, Optional ByVal intCode As Int32 = DBNull.Value) As String
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Feb 19, 2010
can i use an inverse notation in the databindings to enabled or disabled one checkbox?I have a form that has several controls binded, and if i have true in one field in the database i need to check checkbox and disabled it.Something like:
vb.net
chk.DataBindings.Add("checked", bs, "MyDBFieldBool")
chk.DataBindings.Add("enabled", bs, "MyDBFieldBool")
This can be done directly?
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Jan 8, 2009
I used to use ADODC with VB6. Once I've set up databindings I can set a text box or other controls to link with a database's specific field by changing the Text property under Data > DataBindings. I want to change the field the text box links to at different times using code. How can I do this?
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Jun 21, 2010
I have face problem with null value i remove the chk from null value n sql server and when i direct save anything in table it dosen't accept null value but when i save these in my form it accept null value.
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Jun 17, 2010
I'm receiving a byte array from a network device by using the TcpClient class and as I have no idea how much data will be being sent I have to just declare a buffer that is X number of bytes long and keep reading into that until I've got all of the data. I then convert this byte array to a string using Text.Encoding.ASCII.GetString but the problem is that this gets any null bytes that were at the end of the buffer after the string and it includes them in the string. This then means when I do String.EndsWith it doesnt work as I would expect it to because there are just loads of 0 bytes at the end of the string.
Once I had realised that was what was happening (which took a long time as these null bytes are completely invisible when you are looking at the data in String form) I thought fine I'll just use Trim on the string but I've found that this doesnt make any difference at all. I thought Trim was supposed to remove any blank space from the start/end of a string, which I assumed would include empty bytes as well.
So is there any alternative I can use that will trim the empty bytes off the end or do I have to do it the 'manual' way and loop through my byte array before converting it to string and remove any null bytes? One thing that has just popped into my head as I'm typing this is to try using the Chr method and pass it 0 and combine that with Trim like so:
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Mar 27, 2010
In my tabcontrol I have a linklabel and textbox made through code. The goal is to open a url from the textbox by clicking the linklabel I add the linklabel and textbox:
[Code]...
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Jan 29, 2012
How do I add 2 text boxes together textbox one = $20 and textbox two = $40 and text box 3 adds both textboxes together to display = $60?
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Aug 30, 2011
I simply want to show my PayPal balance on a textbox
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Sep 2, 2011
To be clear, what I am trying to acheive is:Have my Paypal current balance show up in a textbox on VB.NET using the PayPal API Not a VB.Net Webbrowser. url...But I keep getting the error Object reference not set to an instance of an object. [code]
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Sep 6, 2009
Does anyone know how to make label1 show the data in textbox1? I simply can't figure it out.Value of type 'System.Windows.Forms.TextBox' cannot be converted to 'System.Windows.Forms.Label'.
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Feb 8, 2009
My sql database is :and on form1 objects is 5 X Textbox and 1X numericupdown I want with numericupdown value=1 then first 5 rows column name fill on the 5 textbox and so numericupdown value =2 then fill second 5 rows fill on the 5 textbox and so for all rows repeat.
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Mar 4, 2012
I have recently published a simple text editor(just as an exercise). the editor has been published using Microsoft Visual Basic Express. Once the program is installed i wanted to make it a default opener for .txt files, so i clicked openwith ->Choose default program and then i was asked to show the location of the .exe. It seems like the .exe of my installed program doesn't exist. where the .exe is on a windows7 or tell me of another way of makeing that program the default opener.
Here is the link to the publish page: [URL]
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Oct 3, 2010
I need to click a button but after doing so a label will show the first digit in a text box and
another label will show the second digit. I know the button control but I don't get how to get the label to say what the first and second digit is.
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