Asp.net - CType NullReferenceException When Trying To Upload A Picture
Jan 26, 2011
I am receiving the following error:
Object reference not set to an instance of an object. 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.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 21: 'Determine the maximum pictureID for this user
Line 22: Dim results As DataView = CType(maxPictureIDDataSource.Select(DataSourceSelectArguments.Empty), DataView)
Line 23: Dim pictureIDJustAdded As Integer = CType(results(0)(0), Integer)
[Code]....
View 1 Replies
ADVERTISEMENT
Jun 12, 2011
1. i hve create school system...so when register new student i want to upload their picture in folder,not database...when upload, all student picture will be in same folder like student picture..
2. i'm using listview to view all student information,so i want picture display in listview column..
View 2 Replies
Jan 15, 2012
I use a datagridview in vb to display the content of a table database.My goal is to be able to upload pictures in the sql database(to have a control near the datagridview that does this) and to display them in the datagridview.
View 4 Replies
Jun 5, 2011
first i create 1 form, 1 picture box and 1 button..
i name button like upload...when i click upload button, i can browse picture..so after i click a picture,automaticly picture will set in picture box and 1 folder like mypicture will be create on C:// and that picture will be transfer into mypicture folder..
View 4 Replies
Jun 12, 2011
how to upload or set piture into windows form using code..i want create a button like browse that can chnge background and every i relaunch application,bckground is still there.
View 1 Replies
Apr 13, 2010
I have a site that has a profile page and I would like to allow the users to upload an image for the profile picture. I forsee a problem if the user select an image that is larger than what I am allowing for the site. Is their a good refrence or example how to accomplish this?
The site is developed in Visual Studio 2008 with VB.NET 3.5.
View 2 Replies
Feb 21, 2010
show me how to resample an image before upload using the following code?
Protected Sub UploadPictureUI_ItemInserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertEventArgs) Handles UploadPictureUI.ItemInserting Dim UploadedFile As FileUpload = CType(UploadPictureUI.FindControl("UploadedFile"),FileUpload)
[Code]....
View 2 Replies
Apr 21, 2010
Can i add resources at runtime? i have created a builder and stub [URL]...so i want to upload like a picture to the created/buildet application with the builder.If you donīt Believe in it, Then it Doesīnt Exist!
View 14 Replies
Nov 20, 2009
Hi there, Please i have a folder in which i've stored some pictures and i want to upload one into a picturebox. the paths of the pictures have been stored in a database. Please help me out with this one. i need to get it done ASAP.
View 2 Replies
Mar 25, 2012
Now I want it to upload it when you click on a button WITHOUT needing to save it. how can you upload a picture from a picturebox? I want the picture thats in the picturebox to upload. The one im having now only works if you save it first:
[Code]....
View 1 Replies
Oct 28, 2010
I need a Visual Basic Program to search and upload to a form a picture(of any format) saved in access database using a unique field(Verification Number). The access database(2003 version) has the following fields; 1. Picture 2. Verification Number 3. ID
View 4 Replies
May 11, 2012
i have this code, how do i incorporate a progress bar into it? Private Sub btn_upload_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_upload.Click
[code]...
View 1 Replies
Oct 24, 2011
Rather than using a Handler(.ashx), is it possible to use a web service(.asmx) to upload?
View 2 Replies
Jul 7, 2010
have a look at this code Dim colors() As KnownColor = CType(System.Enum.GetValues(GetType(KnownColor)), KnownColor()) Since CType is a function that returns DataType ,But here as in the code it seems that CType() is returning array having values that is assigned to color() array. How this is happening?
View 3 Replies
Jul 24, 2009
I have a number of different object types that I would like to pass into a function. All my objects are created from classes with a .Description property. Is it possible to determine the type of object for use as the 2nd parameter in a CType call at runtime? e.g. Debug.Print CType(MyObject, TypeOf(MyObject)).Description (I have Option Strict On) I get errors when I do this.
View 4 Replies
Mar 24, 2011
In vb.net, I got an Enum defined As Integer:
Enum enUtilityTypeDetailStudentEntryWorkflow As Integer
enUTDSEW_Default = 379
[code].....
This works but it adds a lot of noise to the code and it seems like the Enum is already defined as an Integer, making me think, why do I have to assign it again?
View 1 Replies
Sep 26, 2011
I cant understand why this does not work! Hope for your intelligent answers ;)
With
CType(Controls(PicsGame(GameCount)),
PictureBox)
BorderStyle =
BorderStyle.None
View 4 Replies
Feb 29, 2008
Is it possible to change a datarowview object to an integer?
View 3 Replies
Nov 1, 2009
dim testpanel as new panel
dim test as CType(testpanel, Control))
msgbox(typename(test)) ' it gives me "panel"
'i dun get it, how can typename of test give me Panel when i explicitly call it to be converted to a Control type?
View 9 Replies
Jun 16, 2010
I am an experienced C/C++/C# programmer who has just gotten into VB.NET. I generally use CType (and CInt, CBool, CStr) for casts because it is less characters and was the first way of casting which I was exposed to, but I am aware of DirectCast and TryCast as well. Simply, are there any differences (effect of cast, performance, etc.) between DirectCast and CType? I understand the idea of TryCast.
View 2 Replies
Dec 13, 2009
I turned option strict on, wich gave me some errors. The errors are quite easy to fix, but it seems like there are several ways of doing things. [code] 'previoustime' is declared as a TimeSpan, and the column "sluttid" is defined as a TimeSpan-column.Now, as far as I know, there are two ways of solving this; using CType and using DirectCast, like this: [code]
View 4 Replies
Jul 16, 2010
Assume that I have this declaration (according to MSDN):
Private Declare Function PostMessage Lib "user32" ( _
ByVal hWnd As IntPtr, _
ByVal wMsg As UInteger, _
[code]....
And this is how I use it:
PostMessage(hWnd, 516, CType(2, UIntPtr), CType(0, UIntPtr))
Option Strict is turned On. So the questions are:
1. Do I need to use UIntPtr in declaration or it will be better to use UInteger?
2. Do I need to use CType function in these cases or there is a better way for this or I need to avoid declaring pointers?
View 6 Replies
Oct 25, 2011
does your IDE ever get amnesia?in the line before it is clearly defined.in the following line it is not.Maybe it's a faulty translation from Tangible Software.the C example i'm looking at:
IAnimatedMeshSceneNode* newNode = (IAnimatedMeshSceneNode*) oldNode->clone();
translated as:
Dim newNode As IAnimatedMeshSceneNode = CType(oldNode.clone(), IAnimatedMeshSceneNode)
had to make a dummy for it because i can't use arrays with CType.
View 1 Replies
Jul 12, 2010
The below is a snippet from VB that I am porting to a C# rewrite. My question is what is receipt_date after the assignment? Is it still an object or is it a string?
Dim receipt_date As Object
receipt_date = CType(dr.Item("RECTDT"), String)
Would this be the correct C# counterpart?
object receipt_date;
receipt_date = dr["RECTDT"].ToString();
After both of these execute would the VB version, receipt_date be equal to the C# version?
View 2 Replies
Feb 25, 2011
[Code]...
What happens when a user wants to alocate "" as Item(DurationColumn) to integer? I get an exception. clean solution to avoid this and set 0 for ""?
View 5 Replies
Jan 30, 2012
I have this class: Public Class Foo
[Code]...
In the f = "Bar" assignment I loose the previous X and Y values previously assigned. There's a way to overload the operator to assign to the "Value" member instead of creating a new Foo class? Or a way to obtain the target of the assignment to copy the values??
View 2 Replies
Oct 31, 2009
i've got a problem here whereby my ctype doesn't work.firstly, to replicate my case briefly, i've created an extension of control class
[code]...
father.getheight 'compiler writes: Panel class doesn't support getheight, but I've already converted it to a Control with CType!end sub of course if i dim father as Control it works perfectly, but in my case father may be other objects as well that aren't controls so I had to dim father as a general object, is there a fix so i could properly convert father into a Control object?
View 1 Replies
Sep 24, 2010
I have a class that overrides Ctype operator to have conversion from and to String :
Public Class TotoToString
Property value As String
Public Sub New(ByVal V As String)
Me.value = V
End Sub
[Code] .....
View 4 Replies
Dec 27, 2009
I need to programmaticlly check one RadioButton1 in GroupBox1 in my Form.The name of RadioButton and his parent GroupBox is received from global variable 'names'.How to change GrpBx1 to names(0)?
VB.Net
Dim names as String() 'GrpBx1,RadioButton1
'WORKING but not exactly what I wanna while it's fixed to only one GroupBox:
CType(Me.GrpBx1.Controls(names(1)), RadioButton).Checked = True
[code]....
View 5 Replies
Oct 13, 2009
Public Enum Fruit
Red_Apple = 1
Oranges
Ripe_Banana
End Enum
Private Sub InitCombosRegular()
[Code]...
Why does the Ctype work and the Directcast does not with the same syntax? Yet if I cast the selectedValue to an int before I DirectCast, then it works
View 1 Replies
