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hi,
i a have a field in a database from i retrieve data by a recordset.. now if the field is empty i want to display a message .. how i can do tht thx..
e.g DIM imgPath
If imgRecorset.......= empty Then // this part i want ot knw
Msgbox(This filed is empty)
Else
imgPath=imgRecorset.fields("filedname")
End if
THx
Arshaad
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If imgRecroset.field IS NULL Then
msgbox ("Pherr Liyaa Chore Noo")
Else
...
...
...
End Less Loop
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If mcqRecordset.Fields("iconPath") Is Null Then
imgMCQ.Enabled = False
Else
imgMCQ = LoadPicture(mcqRecordset.Fields("iconPath"))
End If
Object not found... error
plz help me thx
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What object is it that isn't found? The recordset? A field in the recordset? The image file?
---
b { font-weight: normal; }
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IF some field of a table IS NULL WHERE PRIMARY-KEY of table is EQUAL TO xyz THEN
//code to execute
//...
//...
Else
//...
//...
END IF
End Less Loop
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Yeah my Primary key is McqID.. and i have amny mcqID.. so any of them may not contain the an image path.. how would i know which image apth is null
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SELECT * FROM TABLE_NAME WHERE ICON_FIELD IS NULL
Change table name and icon field name with appropriate names, your record source will contain now only those fields from table which contain no data. Once this phase is complete update each field accordingly.e.g:
dim fd as openfiledialog=new openfiledialog
for i=0 to recordset.recordcount -1
fd.showdialog
recordset.recordfield(i).add=fd.filename
recordset.movenext
next i
fd.dispose
End Less Loop
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cannot bind to the new display member. Fix please
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Seriously, how is ANYONE supposed to answer such a vague question?
Use some common sense!!
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Apologies, but i am a student and that is the error message i am receiving
in this particular application. The only additional info is (parameter name = newdisplay member.
Rgds DaveChef
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Hello,
I have a basic question regarding 'New' keyword.
For instance I can declare a variable as string (class)
as Dim myName as String = String.Empty
or Dim I as Integer
But when I want declare a button we instantiate it as
Dim b as Button = New Button
I am just trying to understand when (for what kind of classes) to use New key word.
Please some one help to clarify this.
Thanks
-L
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simple answer - always! To instantiate an object you ALWAYS have to use the New operator.
String.Empty is a static instance of the String class - so it has already been instantiated.
dim i an Integer = 1
this is a special case for primitive datatypes, you can get similar functionality for your classes using implicit casting, allowing such code as
Dim myPerson As Person = "Jamie"
but this would, under the hood be doing,
Dim myPerson as Person = new Person("Jamie");
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I am kind of unclear on this yet.
I have just typed
Dim myName as string = New String
and there is a blue line under New String and the tool tip said
"Overload resolution failed because no accessible 'New'accpets this number of arguments"
But when I said
Dim b as Button = New Button
Could you please explain it one more time.
thanks
-L
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Remember that string is a really special case, it is immutable - which I wont go into here but look it up if you are interested.
To add to what I wrote above, The only time where you CANT use the new operator is when there is no public constructor defined on the class, so you cant instantiate a new instance of it, so there is no need to ever write New MyObjectWithNoPublicCtor()
Going back to string, this is the case - String class in .NET does not define any publicly accessible constructor.
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Now its clear  hey thank you once again.
-L
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no problem buddy, as i found out by answering you - the answer is not quite as straightforward as i first thought 
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Try this:
Dim myName as String = New String("Gotcha")
MsgBox ("WoW No OverLoad Resolution Failed Error")
MsgBox ("Yeah Yeah Because You Did Provide Argument " & myName & " with NEW")
--------
End Less Loop
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its cool! donot rocks!
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Hi,
Does anyone know if it possible to display the ink levels of a printer using vb.net. All I need is to display the current ink levels and to update it every 5-10 mins.
Thanks
John
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Asalm o Alaikum,
Sir I am a student of Telecom Engineering. Vb.net 2003 is part of my compulsory subjects. I am not familiar with it.I want to familiarize myself with it.Teacher has given me assignment , to made strandard Calculator in vb.net. I want to know about how operators like( +, -, *,/,= ) works. If u can help me in this respect i am very thnkful to u.
Allah HAfiz
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Look out this bro
http://www.vbcodesource.com/exampleEx.html
In VisalBasic Examples table example with name calculator that is what u need
_____________________
Proud to be Albanian
_____________________
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Hi,
As already posted, there are thousands of tutorials and articles online about writing a calculator - many of these will be in VB, and a quick google search will find them. Knowing how to find things is a very important part of any job and you should learn this skill well.
Writing a calculator can be done very simply, ranging up to the very complex. It depends what you want to learn. As you are a beginner you should start by breaking the problem down into manageable steps.
A typical simple calulator goes like this
1) Obtain a number from the user (tot)
2) Obtain an operator (+,-,*,/) from the user (op)
3) Obtain a number from the user (input)
4) Execute operator on 2 numbers and store back in tot (tot = tot op input)
5) repeat 2) - 4) until op is '='
6) Output tot
I would suggest you try this in a console application before trying to build a GUI, also if you have studied OOP yet then try to incorporate this into it (think Calculator object, Operator object, Number object etc).
remember, this forum is for code-related queries, so when(if?) you encounter a problem coding this then do post the code, the problem you are having and any other relevant info and we shall try to help you out.
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How can i write a media player (withOut Windows APIs) like windows media player ( please send a refrence)
MHF
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take a look this bro
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=4582&lngWId=10
_____________________
Proud to be Albanian
_____________________
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It is Goog but i want a program without using windows APIs
Thanks
MHF
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