Default Value For Image Data Type Field?
Aug 16, 2010What value should I put as a default value for Image Data type field on a record?
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Conversion From Type 'DBNull' To Type 'Decimal' Is Not Valid When Field Has Data?
Feb 7, 2012I am pulling data from a local MSSQL database using a stored procedure, then send the data to a web service. Every part of the component works well except for a pesky problem will a DBNull being returned from the DataRow field, when I know that the field is not null and has valid data. The database and associated INSERT statements that add to this field are designed to not allow NULL entries. When I debug break the program on or right before the line that throws the error I see that the field has valid data for the current row.If I add a null check to the code (as below) the operation continues as normal:
Dim dataResultsTable = Me.myViewTableAdapter.GetData(int)
For Each myDataRow In dataResultsTable.Rows
If worker.CancellationPending Then
[code]....
Why is the read operation returning DBNull instead of the data in the database?
EDIT: Just to be clear, the operation does return the proper data, but the data is not being saved into the variable.
VS2008 - Force Default Value In Text Field/validate Data Is Numeric?
May 11, 2009Dense student here with little sleep here during finals week...I have a text field being read on a button click event (along with lots of other information being read). This field needs to have a number entered.
I either:
1) Force a default value (i.e. - "2")
2) Verify there's something in the field AND that something is numeric...
DB/Reporting :: Default Value For 'bit' Data Type In SQL Express?
Apr 24, 2008What is the best way to set the default value for 'bit' or boolean data types in SQL express? I am using the data base explorer in VB Express 2008 and the only way I seem to be able to do it is by using ((0)) for false and ((1)) for true.
View 1 RepliesData Type Mismatch/ Unknown Field Name?
Jun 6, 2012I have problem in my application when updating 3 items otherwise it is as good as work. The problem is when updating the username to the access database an error showing that "Datatype mismatch" when updating the date and time field an error occurs and tells that the "Unknown field type". This is my code where bold faced lines have errors:
Dim objCmd As OleDb.OleDbCommand = New OleDb.OleDbCommand()
objCmd.Connection = con.con
'Make a command to insert data
[Code].....
Size Of The Length Field For A VB String Data Type?
Feb 10, 2010A string can contain from 0 to approximately 2 billion (2 ^ 31) Unicode characters. Does this mean the length field for the string is a 4 byte unsigned binary field, or is it a 4 byte signed binary ?
View 4 RepliesCan't Input Number To Database Where My Field Type Data Money
Aug 19, 2009How can input number to database where my field in database data type money.[code]...
View 5 RepliesDB/Reporting :: How To Update A Money Data Type Field Using Vb 2005
Aug 18, 2009I am linking to an SQL table with 'Money' field. When i try to update this field in VB.NET I get an error message that "Can not convert a character value to money. The char value has incorrect syntax".
[Code]...
VS 2005 Check TextBox Bindingsource Field Data Type
Apr 15, 2011Lets say I have a form with several Textboxes that are all bound to "bindingsource1". I'd like to be able to check the field data type each textbox is bound to. Something like this,
Dim ctl As Control
For Each ctl In frm.Controls
If ctl.GetType.IsAssignableFrom(GetType(TextBox)) Then
[Code]....
Rename Field Headings And Change The Field Type?
Jun 28, 2010I am trying to edit a dbf table. I would like to be able to rename field headings and change the field type, ie string or dbl, and the size of the field. is this possible to do with vb.net. I have connected to the dbf file but after that am lost on what to do.
View 3 RepliesSave Data Type Image By Code?
May 3, 2012how to save data type image by code (data:image/gif;base64.....) as title.I found no way to direct save to file or export to picture box,It only can shown on webbrowser..
View 2 RepliesSave A SQL Server Image Data Type To The File System?
Jul 12, 2010I'm having issues with the way I've been reading my image datatype blobs from my SQL database (code below). This code works fine when I access this page directly. The PDF will open and works just fine. However, when I try to use this page to download a file and save it to the file-system programmatically, it fails (500 server error) and I've verified that it's the same URL either way.So, my question is what is the best way to download a file from a database image datatype and save it to disk?PDF.aspx
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Collections.Generic" %>
<script runat="server">
[code].....
Get Reference To The Error Image That Is Loaded By Default If There Is No Image When Using Imagelocation?
Dec 8, 2009How do get reference to the error image that is laoded by default if there is no image when using imagelocation I am trying to build an IF statement to only do something if picbox is not = error image
If PictureBox1.Image <> Image.error.system.drawing.Bitmap Then
Open Image In Default Image Viewer Using Program?
May 4, 2012Execute the default image viewer when i pass the path of the image.
View 2 RepliesSave An Image In A Picture Box To SQL Database Image Field
Feb 3, 2011Using VB.net 2010, Windows 7, and SQL Server Express 2008 R2.
I am trying to save an image from a picture box to an image field in SQL Server. The line of code below produces an error. What am I doing wrong?
...code
objCommand.Parameters.AddWithValue("@ss_no", mskSS_No.Text)
objCommand.Parameters.AddWithValue("@d_code", txtD_Code.Text)
[Code]....
Automate Website, Date Field Default?
Apr 20, 2010Im building a little program to automate downloading of orders for work but having a few problems.One of the pages has 2 Radio buttons on it, One says "download all" and the other "Download orders for selected dates"Now the radio button i can select fine, It goes to the "download orders for selected dates" one nicely but im having trouble putting the dates in on its own.
The "to" date is ok as it will always be the sate you run the program on so have used the "today.date" string and it puts this in ok. But with the from field i need to be able to select this.
I am using a datetime picker box on my form and can get it to put in the date in the box on the website, But to do this i have to click on the datetimepicker and click on the date, It doesnt already select this.
I would like it so i select the date first and then click my Login button, It goes off to the website and fills in all the details and then the next popup i get is where to save the file.So is there a way for the date time picker to put the current selected date in automatically?
[Code]...
Parameters Data Type - Add Parameter With Same Data Type As Column Data Type
Feb 26, 2012For each column in data table i want to add parameter with same data type as column data type. But looks it's not that simple.
Dim cmd As New SqlCommand
Dim dType As New System.Data.SqlDbType
For Each cl As DataColumn In DataTable1.Columns
[CODE]...
How can I do this?
IDE :: Assigning ToolstripButton.Image To Its Default Image?
Jun 16, 2012I m dynamically assigning data to the ToolstripButton like its Text & Image. At one stage i want it to be cleared i.e. ToolstripButton.Text="" and ToolStripButton.Image = To its default image (The image which
is available on design time or ToolStripButtons default image byVS2008)..
Check If A Field In A Data Table Is Null Before Creating A Textbox Bound To That Field?
Feb 24, 2010I am building a data based application using VB 2008 an SQL Express. I need to create textboxes on my form using code, (With & End With) method. I need a simple code string that will allow the app to check if the field to wich the textbox wil be databound is Nul, If so the textbox will not be created.
View 8 RepliesVS 2008 - Default Date Versus Null Field
Aug 26, 2011I 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?
Create A Function Which Have Either 1 Parameter With A String As Data Type Or 2 Parameters With Double As Data Type?
Jun 11, 2012I need to create a function which have either 1 parameter with a string as data type or 2 parameters with double as data type.Something like the substring method.
View 2 RepliesData Type Mismatch Between Vb Date Datatype And Ms Access Datetime Data Type?
Dec 27, 2010I'v designed a ms access database table with one field having Datetime datatype. I can Insert data into it from vb.net front end by trns_dt DateTime.Now.DateBut when I fetch records from the tableand assign the dataset datasource as da, it shows datatype mismatch error.
daleDbDataAdapter("SelectDaily_Transactiondtp_from_dt.value dtp_To.value con)
dsDataSet
[code].....
C# - Make The Default Value Of A Type As Nothing?
Nov 10, 2009For example Dim aInt as Integer should have the value as nothing instead of 0.
View 6 RepliesDefault Type Of Function?
Jan 27, 2010i want to know what is the default type of function or method declared without public,private,friend,protected,protectedfriend keyword
View 3 RepliesWhat Default Value Type Object
Aug 13, 2009i want to know what default value type object in vb.net.I can't find type variant in vb.net. Many forum say type variant it change with type object...
View 1 RepliesSet Application To Default On All Of Certain Type Of File E.g (RTF)
Oct 11, 2009I have made an application and It opens rtf files but I would like it to become the default application for opening this file format.
View 1 RepliesSet Default Value For A Unit Type Parameter?
Apr 12, 2011I want to include an optional parameter in a function statement that is of the type Unit. For example:
Public Shared Function NewTable(Optional ByVal TableWidth As Unit) As Table
Optional parameters require a default value, but I cannot figure out how to set a default value for a Unit type.
Converting Icon Type To Image Type
Sep 24, 2009Dim Button As ToolStripButton = New ToolStripButton
Button.image = Icon.ExtractAssociatedIcon(exefile)
I try that code, and it just throws me the error that type Icon cannot be converted to Image. So how do i get around this? And does "ExtractAssociatedIcon(exefile)" work on exe files? Admittedly i don't really know what im doing
Converting Icon Type To Image Type?
Oct 28, 2009Dim Button As ToolStripButton = New ToolStripButtonButton.image = Icon.ExtractAssociatedIcon(exefile)I try that code, and it just throws me the error that type Icon cannot be converted to Image.So how do i get around this? And does "ExtractAssociatedIcon(exefile)" work on exe files?
View 3 RepliesSet Field Value On Value Type Using Reflection?
Mar 23, 2010.NET I want to clone a value type's fields. How can i set a field value on a value type using reflection (or something else dynamically)?
This works for reference types but not for value types. I understand why but I don't know an alternative.
shared function clone(of t)(original as t) as t
dim cloned as t
'if class then execute parameterless constructor
[Code]....