Database Pro - Identifier Part Cannot Be Null
Dec 3, 2009When the SQL Server 2005 Wizard is used to create a database project, the following error is issued[code]...
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Send Link Contains A Unique Identifier And Verify The Unique Identifier In The Login.aspx?
Jan 6, 2012This my working method to send a email
Sub emailConfirm()
Dim email As String = txtMail.Text
Dim name As String = txtPrenom.Text + txtNom.Text[code]....
note:I want to send Link contains a unique identifier and verify the unique identifier in the login.aspx.I don't know when to do this...I found nothing interesting on the net ...
Database Sql Server Compact Edition 2005 - Save In A Database - Column Cannot Contain Null Values
Oct 15, 2009Ive created one database Sql Server Compact Edition 2005, with one table ("Cliente") I know that I can created my database good, but i have a problem saving information since three textbox, in my table(With columns "Nombre" "Apellido" "Cliente". In my form there is a button save ("Guardar"). When I do click in my button appear the next message : "The column cannot contain null values. [ Column name = Nombre,Table name = Cliente ] " and happen the same with apellido and Id_Cliente. And this happen becouse my code cant save the information....
This is the code
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Imports System.Data
[CODE]...
And the code for my button is:
Private Sub cmdguardar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdguardar.Click
Dim myconnection As SqlCeConnection
Dim mycommand As SqlCeCommand
[CODE]...
VS 2005 Transfering Data From One Part To Other Of Database To Other?
Jul 19, 2009The form is like this:A database contains six columns:"From Bank","From Account","From Balance","To Bank","To Account","To Balance"On transfer button click,The balanced will be transfered and added to the "To Balance" of "To Account"i did the code for form load but i cant get throught the transfer money
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
[code].....
Multi Form / Part Application Need To Make Part Protable For Transfer
Feb 22, 2011im making an application in vb.net (duh!) anyway i have created and coded the whole project and it performs exactly as i want it to (i dont need code help). my problem lies with the fact that my project is 2-3 parts
1.a setup form that gathers inital data about the enviroment stores this data encrypted in a config file. after inital setup this form is not displayed again. but needs to be run on both computers
2. the second form is the real application form im in the process of turning this part in to a background service anyway this form is the one that establishes the connection between two nodes it works correctly
3. the config files
anyway here is my problem i want to make this application distributional with just one file the (.exe) and have this .exe make everything else happen. it runs the setup form and creates the first config file which it does then it needs to produce a copy of just the second form and the config file to transfer to workstation #2 that will run independtly without the whole application which i cant make happen then it needs to turn both workstations application on by only starting one on either computer and invoke the other computer to start its corrosponding app also no idea how to make this happen any ideas or suggestions as to where to look to try to find my answers.im thinking i might need to make two seperate applications (a setup app, and the running app) and include them both in a project and use the setup.exe to to package them together this is a little side project that im making for my self to use to make programming a little easier so i plan on giving it out to some fellow students to test and tell me what they think so im not really worried about ease of use or complicated procedures yet but if it turns out to work and actually be of use to anyone else i would be willing to rewrite it to distribute to the masses but for now i just want it to work for me.
Add Null In Access Database?
Feb 10, 2010I want to add a null binary field in Database.[code]...
View 2 RepliesAdd A Blank Selection For Null If It Get Value From Database?
Jun 11, 2009i have a combobox which get value from database through dataset. when i run the program n click on the combobox, the value is auto fill in with data from database. is there anyway to add a blank entries to the selection on the combobox??
View 5 RepliesAsp.net - Net Null Reference On Database Connection?
Jun 13, 2012I know I'm being an idiot here and I just can't work it out. But i'm trying to take some data back from a vb.net database. It's falling over with a Object reference not set to an instance of an object error. And before the code runs it's saying the variable is being used before it's set, but I can't see how. Code:
Private taNotifications As dsDataTableAdapters.NotificationsTableAdapter = New dsDataTableAdapters.NotificationsTableAdapter
Dim notification As dsData.NotificationsDataTable = taNotifications.GetDataByClientID(userrow.UserID)
If notification.Rows.Count > 0 Then
Dim notificationrow As dsData.NotificationsRow
Dim forwardURL As String = notificationrow.ForwardLocation
End If
It falls over on the Dim forwardURL As String = notificationrow.ForwardLocation
Convert Null To Zero In Access Database?
Jan 16, 2011Considering that Grade.firstExam, Grade.secondExam, and Grade.finalExam are all TEXT and not numbers, i can't get the exact solution to convert null values into Zeros. I already tried to use NZ() but it returns an error message (Undefined Function 'NZ' in expression)im using VB.net with MS Access as my database. i also imported System.Data.OleDb Namespace.
[code]...
How can i convert empty string or null that exist in the field?
Database Call Returns Null?
Jul 22, 2009Is their a more elegant way to assign a space to a value, if a database call returns null for a data set column? I am doing the following check which is pretty tedious:
If (ds.Tables("employee").Rows(0).Item("txtNamePrefix").IsDBNull(0)) Then
txtNamePrefix.Text = ""
Else
txtNamePrefix.Text = ds.Tables("employee").Rows(0).Item("txtNamePrefix")
End If
Get A Null Value From Database To A Checkbox In Gridview?
Apr 6, 2009i have a checkbox in gridview.
<asp:CheckBox ID="chkStatus"
runat="server"
Checked='<%#GetStatus(Eval("VaccinationCompletedStatus"))
[code].....
How To Insert Null Values To Database
Nov 17, 2011I am working asp.net vb application. I have set of values to be inserted to Database.But their some fields are optional to be filled. I need to check the textbox empty. If empty I should not enter the value to Database. How to work on this?
View 4 RepliesNull Value From Database And Jagged Array
Feb 12, 2012I need to scan database and insert its values into an array. But I'm having some difficulties in handling null values and array.
The database looks like this:
0 1 2 3 4
30 31 32
33 34
36 37 38 39 40
38 39 47 48
I want to make array rr_item which gonna looks like this:
arr_item(1)={0,1,2,3,4}
arr_item(2)={30,31,32}
arr_item(3)={33,34}
arr_item(4)={36,37,38,39,40}
arr_item(5)={38,39,47,48}
Every code I've tried result in error everytime I tried to insert null value into any kind of c=variable, including array which I want to use. And I'm not quite sure with what I'm doing in jagged array I want to build.
sql_list = "SELECT * FROM retail"
oledbCnn = New OleDbConnection(connetionString)
Try
oledbCnn.Open()
[Code] .....
Saving TimeSpan With Value Of 00:00:00 To Database - Seen As NULL?
Dec 6, 2011I'm trying to save a TimeSpan variable from VB into a SQL database, into a non-null column.It works fine for other values, but when I try to save 00:00:00 I am told that I cannot save NULL into a non-null column...Is there a way to get it to actually save this rather than think that it's NULL?
Note: This code is a method in a class, which has a property:
Private mCommand As New SqlCommand
Dim Param As New SqlParameter
Param.ParameterName = "@" + ParameterName[code]......
Bound Text Boxes When Database Value Is Null?
Dec 4, 2009My application has textboxes that are bound to DataSet fields of a SQl Server 2005 database. The columns in the database allow nulls. The column properties in the DataSet have AllowDBNull set to true. Attempting to write the un-changed data back to the database replaces the NULL values with "", and the update fails on the datetime columns with an error about being unable to convert "" to a date. It appears that the problem is that the null values from the database are being converted into empty strings when the textbox is populated.
View 4 RepliesParse Value From Database Datareader And Handle Possible NULL Value?
Feb 16, 2011I have run into this problem a few times and have never come up with a good answer. I figure others must have dealt with this already.I have a datareader returned from the database and I want to use the values therein however values may or may not contain NULL. I would like to have a unction that takes in the value from the datareader and returns the value if it is not NULL and blank space if it is NULL.The problem I have is that the data-type of the variable I am testing is variable. It can be a String, and Integer or a DateTime. Can anyone suggest a simple way to test the value and then return the original value (as same data-type if possible) or something else if it is NULL
View 5 RepliesProperly Dealing With Null Database Values In .net?
Jan 1, 2012I am looping thorugh a datatable and and printing each row to the console and I keep on getting a dbnull error. I inserted an if statement in my loop to try and catch it, but I can't seem to get it to work.
[Code]...
Set Database To Null When Datetimepicker.check Is False?
Aug 12, 2011How to set database to null if datetimepicker.check is false?what is the code other than empy string ""?[code]...
View 4 RepliesSql - Write Database As Null Instead Of Empty Strings?
Jan 12, 2010How can I change the following code to write to the database null instead of empty strings?
Public Sub SetChangeRequest(ByVal referenceLeaseID As Integer, _
ByVal referenceCustomerID As Integer, _
Optional ByVal custUnitNum As Object = Nothing, _
[CODE]...
Unable To Write To A Database Null Reference
Mar 1, 2009 am trying to write to a database via a stored procedure. I am trying to save my values to an object and then write to the database. When I click the button to save the record I am getting a null reference.The below is from the frmDMR class.
Public Class frmDMR
Private m_dmrissue As DMRData
Public Property NewDmrIssue() As DMRData
[code]....
VS 2010 Handle Null Dates In A Database?
Apr 18, 2011I am reading dates from a table in a database to display in a DataGridView column that is formatted as a date. The problem is that when the value is null in the database my program errors out because it cant convert the value to a date. How do you guys handle this? *Edit: If I set the value of my date variable to "Nothing" it displays as "1/1/0001" in my DataGridView, and I would like the cell to be empty for the null dates.
View 24 Replies.net - Identifier For TAB?
Sep 11, 2009What identifier should I use for TAB (e.g. for output to text files)?There are many choices:
vbTab
ControlChars.Tab
A constant (or public member) in my application set to Chr(9)
Asp.net - Taking A NULL Value From The Database And Assigning To A Date Variable
Mar 11, 2009A stored procedure returns data about a user record including a nullable datetime column for their last login date. Which one is the better choice in dealing with the possibility for NULL values when trying to assign a .Net date variable?
Try
_LastLogin = CDate(DT.Rows(0)("LastLogin"))
Catch ex As InvalidCastException
[Code]....
Which is the preferred method of handling possible NULL values from the database? Is there a better way than the three listed?
Edit #2: I have noticed that the TryParse method does not play nice when trying to assign to a Nullable type.
Conversion Error When Trying To Call An Image If Database Value Is NULL.
Feb 4, 2012I am trying to load an image onto a web form depending on the image's URL path inside a database. I can get this to work, however I am trying to display a dummy image incase the record in the database has no image and the column is NULL.
Below is the code that I imagined would work but I receive an error:
Conversion from type 'DBNull' to type 'String' is not valid.
'// Load Item Image in imgMenuItem Image Control //
If (Not IsDBNull(Rdr("img_url"))) Then
imgMenuItem.ImageUrl = Rdr("img_url")
[Code].....
Insert NULL Into Database If Form Field Is Empty Using ASP.NET & VB?
Jan 18, 2011I have a form and stored procedure that inserts the data from the form. It works fine except that if a field isn't filled in it doesn't insert a NULL into SQL it inserts "".
I've tried a few different ways but none seem to insert NULL, the one below still inserts "", can anyone point me in the right direction?
Here is the required part of the code, if you require more just let me know.
Dim rdr As SqlDataReader
Dim cmdInsert As SqlCommand = New SqlCommand()
cmdInsert.CommandText = "spPersonalDetailsInsert"
[Code].....
So if I enter nothing into address1 field it should write NULL to screen but it always writes NOT NULL. What does an empty form field equal? in classic ASP it was always "".
Optional Parameter Not Working When Trying To Pass Null Value To Database?
Apr 10, 2009I am hardcoding an insert statement to a database, based on certain details a user enters into a windows form. The form has a few textbox and datetimepicker controls for the purpose. This form enters a single row in a single table in the database.The table has a few possible null columns defined, in those cases where the user does not have any data for those columns at that particular time.
I have to provide controls for passing data to those null columns nevertheless. In my case, I have two such columns that accept null values, and two corresponding controls - a textbox and a datetimepicker. The datetimepicker has a checkbox added to it so that if it is supposed to be null it doesn't pass the default current date value, and remains unchecked to explicitly specify that it is supposed to be null. By default it is unchecked.
My code is structured as follows:
Form1:
'the sub referenced here resides in a dll file in my dataaccesslayer code, and in my actual example is referenced properly.
'I have shortened the code here for simplicity
[code]....
Now it gives me an error whenever the code comes to the executenonquery(), and says something to the tune of "SqlDateTimeOverflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM."
I think the value of 'Nothing' from the subprocedure's paramter is not being assigned to the sqlcommand's parameter as a database NULL, which is what I need to pass to the database.I know instead of using optional parameters I can easily create overloaded subprocedures where one sub allows not passing values where the column(s) is supposed to null and other overloaded subs permit combinations of which column(s) are null or not. But it is simple as long as there is just one, or at the most two null columns in a table. If I have dozens of null values in a table that the user can choose to enter or not in a data entry form?
Update The Access Database With NULL Values Using OLE DB Command?
Jan 5, 2010How update the Access database in VB.Net with NULL values using OLE DB command
View 2 RepliesHow To Dim Non Valid Identifier
Feb 26, 2010I am working on a periodic table of elements with buttons for each element-done
next step. textbox + chemistry formulas = grams to mole conversions/ moles to L/ moles to molecules.
The problem I'm having is dimming the chemicals Arsenic(As) and Indium(In). I need to dim these as integers = to their atomic mass G/Moles. But I am not able to Dim them because they are highlighted in blue and the help tip comes up as "keyword is not a valid identifier" is there anyway I can tell VB to not use "In" and "As" how it normally does and use it for integer values?
Identifier 'Of' Is Not Valid?
Feb 25, 2009I instaled vb.net 2005 and when i want to see my old project that has been created by vb.net 2003 (when i click on one of the forms that i created) vb.net 2005 show me this error "
One or more errors encountered while loading the designer. The errors are listed below. Some errors can be fixed by rebuilding your project, while others may require code changes.
Identifier 'Of' is not valid. Hide
Compare Only Day Part And Month Part?
Jan 12, 2012my requirement is that i have to count occurrence of a certain date and between two months
suppose i have 10-jan-2012 now i have a date range 1-jan-2012 between 1-feb-2013 my requirement is that if i find 10-jan between 1-jan-2012 between 1-feb-2013 irrespective of year i know that 10-jan will come twice between 1-jan-2012 between 1-feb-2013 i am not understanding how to do this.i meanto say that i have to compare only day and month part of the date which will solve my problem