Is there any way that I can use to check the datatype of an object??What I want to check is like below (yes, below will not work. Its just a scratch logic).
example:If TypeOf(objPasser) = Integer Then
.....
ElseIf
[code]...
anything wrong with using datatype object and determine datatype in class property? I have a typed dataset and it has several integers columns that are null in the db. and when I make a call it throws exception.is there anythign wrong with setting it as object in my dataset.. changing the throw exception property to Nothing and passing it to my property as integer?
for each row in myDS.DataTable
cRate.CustID = row.CustID
next row
and in my class
Public Property CustID() As Integer
Get
Return _custID[code].............
I set the phone number field to number datatype.......in the access database...the field size is set to long integer.While trying to save a data in the database, when i enter a 10 digit number then an exception is thrown but upto 9 digit it works great.
View 39 RepliesI create one column which is tinyint then I go to VS2008 and create typed dataset by wizard. Then I check that column's datatype it is now byte datatype. MS SQL 2005 tinyint = VS2008 byte ?
View 2 Replies
I have a VS2005 utility that I'm working on that has an Access 2003 backend. A couple of days ago, my boss asked that I change one field in two tables from TEXT to MEMO, to allow more information to be put in. In doing some final pre-deployment testing, I find when I hit my button to pull up the list of tickets, I get the error
"System.Data.ConstraintException was unhandled
Message="Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.""
The datagrid is based on a query I have in the database. The query runs fine, and when I go through the XSD and go into Query Builder, the QB is also returning data. I have made the various changes to the utlity as suggested by Microsoft, but no luck. When I put the two columns back to TEXT, the Grid works fine.
How the heck do I set it up so that the grid will recognise the new data format? The number of characters for the individual columns is set to 37,627 (I believe, it's whatever the default is). I only have 200 characters in my test data. I need to rebuild the whole dataset - this deployment has to be done by the end of the day tomorrow and I have a whole pile of other stuff left to do.
I'm attempting to pass in a collection of dates to a T-SQL 'IN' clause via a date array (see below for how data is collated).
'Workout weeks difference between start and enddate
Dim wksDifference As Integer = CType(DateDiff(DateInterval.WeekOfYear, bookingStartDate, bookingEndDate), Integer)
[code].....
I have a table with a Real datatype field. I just can't multiply it with other integer fields although the editor doesn't show any error - the result is always '1'.
View 4 RepliesI'm using a 3rd party chart COM object (National Instruments CW graph) to plot data versus elapsed time.The x value needs to be a VB6 equivalent Date type which is a .NET DateTime datatype.What I need is a way to convert a TimeSpan datatype to a DateTime datatype.
Dim testTime as System.DateTime 'date
Dim plotTime as System.DateTime 'date
Dim elapsedTime as System.TimeSpan[code].....
I have a database in mysql. The column in table is of datatype time(0)
Similarly I have a control datetimepicker in vb.net I have assigned format property as custom to the control and the CustomFormat property as HH:mm:ss tt so that it can just provide the time. I dont want the date to be in it.
Issue comes when I try to retrieve the value from database I get an error as Converion of type 'Timespan' to type 'Date' is not valid
Try
Dim myCommand As SqlCommand
myCommand = New SqlCommand("select * from [HMS].[dbo].[DoctorSchedule] where DoctorID='" & txtDoctorID.Text & "'", Connection)
[Code].....
I am working on a produce inventory database in my VB Express program.I have a form on the bottom and a spreadsheet at the top. I want to enter all the data in the form and have that data automatically transferred as a group to the spreadshet in the upper part of the page when I press a button.I know that there's an insert function.I set it up correctly. The problem is that I have to convert the textbox, which contain string data, to the datatype used in the database spreadsheet.HOw do I use CAST or do this?Here's the function I am using:
Me.TableAdapterManager.InventoryTableAdapter.Insert(IDTextBox.Text, fruitName, unitprice, unitsize, unitIn, unitTransit, unitOut)
Evernything is a string cause the data is coming from a textbox, I need to convert it to the datatypes used in the database.Also how do I use the CAST and Convert functions
i have this code in asp.net 2005 page under vb codes on myreader.Read gives me "variable myreader is used before it has been assigned a value a null reference exception" and in the ex msg " object reference not set to an instance of an object".
View 5 RepliesI am having trouble with this piece of code. This is an event when a check box is clicked. It gives me an error "Object Reference Not Set To a Instance Of An Object"I am gathering that something here needs to be AS NEW something but I have tried a few things and can not get it straight.
If Me.ckbDefault.Checked = True Then
Dim current_indexno As Integer
current_indexno = Nothing[code]....
i trying to do login form, if user & password correct, then will show Main Form. First time login is no problem at all, after closed the Main Form, it will back to login form. Problem come when i try to relogin again & show "Object Reference not set to an instance of an object" when try to access the database. Attach my code here:
frmLogin -
AppPath = Environment.CurrentDirectory
DBFilename = AppPath & "DatabaseBT2 Test Results.btd"
frmMain.txtDBFilename.Text = DBFilename
[Code]....
For some reason, on the line where I try to set the value of the key, I get the following error:
Object reference not set to an instance of an object
vb Private Sub writeToKey(ByVal regValue As String)
Dim regkey As RegistryKey = Registry.CurrentUser.OpenSubKey("SoftwareMicrosoftWindows NTCurrentVersionWindowsDevice")
regkey.SetValue("Device", regValue, RegistryValueKind.String) 'error occurs here
regkey.Close()
End Sub
I am attempting to figure out why this code is not working in VB2005.I am trying to run a check on a set of 25 buttons in a 5 by 5 square. they are label "cmd" & X & "x" & Y whereas X and Y are the x,y coordinates.cmd1x1 through cmd5x5 I am trying for this code to set varMapBefore() to either 0(for D) or 1 (for L) for each of the buttons cmd1x1 through cmd5x5 and then join them together at the end for an output.but varMap wont act like an object. What am I doing wrong?
Private Sub cmdStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdStart.Click
Dim varMap(0 To 24) As Object, varMapBefore(0 To 24) As String, varMapAfter(0 To 24) As String, varCheck As String
Dim varCount As Integer, varX As Integer, varY As Integer
varCount = 0
[code]....
while writing some value to registry i am getting error as Object reference not set to an instance of an object. my code is like this
[Code]...
As the title says i am wondering if it is possible to detect and object lets say a radio button is on a picture box
View 2 RepliesI just want to check and see if this object is null. if i do not and it is my applications closes.I have also looked into a null reference exception. I will do whatever as long as it handles "null".[code]
View 2 RepliesI am passing various objects to a subroutine to run the same process but using a different object each time. For example, in one case I am using a ListView and in another case I am passing a DropDownList.
I want to check if the object being passed is a DropDownList then execute some code if it is. [code]...
How can I check if an object (in this case my object would be a ButtonBox) exists inside a GroupBox but in a exact location.
Something like this :
If Groupbox1.NameOfButtonBox.location(40,190) exists then
Do my code
end if
I know the syntax is completely wrong but it's just an example
I am trying to check whether an object is of a particular class type, or if it derives from a particular class type. I've tried to do this muliple ways. But have not had much success. I am using VB.NET.
Here is the code that am using:
If Me.Page.GetType() Is GetType(AALASWebsite.ContentPage) Then
hlPrintPage.Visible = False
End If
I have a form called document_form. I have three variables:
Dim Doc1, Doc2, Doc3 as Document_form
How do I check if a particular form exists? I want to show Doc1. If it does not exist I have to first create it.
Something similar to:
If Doc1 = Null Then
Doc1 = new (document_form).
End If
Simple question...is it possible to check the backcolor of an object, like a label for instance? What I want to do is check if a label's backcolor is green (or some other color) then have something else happen based off the color. Here is what I tryed, but neither worked...
[Code]...
I'm curious to know if there's a good way to see if an object is a System.Drawing.Color before I try casting it to one. Right now it seems the only way I can do that is to put it in a Try/Catch block and if it hit's the catch part then I know the object isn't a color.[code]I really don't like this because there's a slight flicker while it fires up the Exception handling and I would really rather use an If Else End If for this than a Try/Catch.
View 5 RepliesI have some code which gets child items for a menu via the GetChildren function which takes a list of menuData: Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))
For Each menuData As MenuData In builtMenu
If menuData.Children IsNot Nothing Then
menuData.Children.AddRange(GetChildren(menuData))
End If
Next
If I check if menudata.children isnot nothing, it always is nothing because the GetChildren function is yet to run (providing the child items, which do exist). If I remove this check and just have this code:
Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))
For Each menuData As MenuData In builtMenu
menuData.Children.AddRange(GetChildren(menuData))
Next
Then I am presented with a Object reference not set to an instance of an object error on menuData.Children.AddRange(GetChildren(menuData))
I have a form that allows me to drag and drop pictures but I want it to check if the object is in the correct location
*curpic = the current picture that has been selected
If curpic.location.X > bx1.Location.X And curpic.location.Y > bx1.Location.Y Then
If curpic.location.X < bx1.Location.X + bx1.Width And curpic.location.Y < bx1.Location.Y +
[code].....
How would i check if an object is in a certain area inside a form?
-----------------------
0
----------------------
For example lets say 0 = radiobutton1, inside a forms. What would be the best method to check if the radiobutton lies within this region?
I have an object that may have been inflated via a plain old DataContext, or may just have been new-ed up with just its .ID property set. There's no way to know for sure. I'm looking to rehydrate the entire object from whatever is in the database. If the object was new-ed up, I can call .Attach() on the table object and refresh from the Data Context with no trouble. But, if the object was already inflated from the DataContext I get the error: "Cannot attach an entity that already exists.". There's no timestamp field or anything like that - just an integer primary key being used to control the rehydration. I'd like to know if there's a way to conditionally attach. Here's the code - it works the way I want it to, but this seems a hackish way to go about it:
' myDC is a shared instance of a vanilla DataContext...
' myObj is an instance of a linqed-up `SomeLinqObject`
Dim tbl = myDC.GetTable(Of SomeLinqObject)()
[Code[,,,,,
How I do set the webbrowser object to check the link address I have clicked and if the link is within the host I approved?
View 2 Replieshow can i use value (23,32) in sql column datatype int how can i use comma in column data type int
View 8 Replies
