How To Deal With Execute Scalar Command That Return Null
Jan 10, 2012
I want to retrieve total value from sales table in sqlcommand object. Below is my sample code.I will get error if there was no data in the tabel that matched my query saying that null could not be converted into decimal.
I would not get error if there was data that matched my query and returned the total value in tmpSales variable.My question is what is the best way to deal with this situation?
Dim CmdTmp As System.Data.SqlClient.SqlCommand
Dim tmpSales As Decimal
CmdSales = New System.Data.SqlClient.SqlCommand("SELECT SUM(Total) FROM Sales WHERE Date>= '1 Jan 2011' And Date<= '30 Jan 2011", ConDB)tmpSales = CmdSales.ExecuteScalar
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Feb 25, 2010
Using VB.Net and C#.Net
Using 3 Tier, I was executing this query in DataAccessLayer, i want to call this query in ApplicationLayer throgh BUsinessLogicLayer.
Code.
Cmd = New SqlCommand("Exec delTable", con)
cmd.ExecuteNonQuery
I want to return this execute command like this,
In application Layer How to call this?
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Feb 25, 2010
[Code]...
how can i get this code to return all values instead of just the first value ?
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Apr 1, 2009
When I type in cntrows. I get all my table variables except the one I want which is TotalComments. How do I return the Count from my scalar query? I have a Table Adapter named :
[Code]...
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Jan 4, 2011
I am currently writing a scalar valued function and I'm having a few issue with the returned result. I have narrowed the problem down to a calculation that convert the difference between two dates as a percentage/decimal. No matter what I try the return value is always a whole number
set @earnedpremium = (@premium * @pretripearnings) + ((@premium - (@premium * @pretripearnings)) * cast((datediff(day, @outdate, @experiencedate) / datediff(day, @outdate, @returndate))as decimal(5,2)))
The cast section needs to return the percentage, I know the rest is working fine through some elimination and testing.
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Jul 22, 2010
I've a procedure like this:
[Code]...
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Sep 17, 2010
[Code] Now the problem is that after i put this user-control in a form, I have to set a value for the Handled file. Otherwise it gives me a value cannot be null exception. Is there a way that i can set code that would execute in the case of the value being null? [Code]
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Mar 29, 2010
I'm wondering, in Visual Basic 2008, how to execute an external dos command and get its output without help of an intermediate file (to speed up)?
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Jul 1, 2010
Its something in the syntax for the command.
They provide this example in VB:
Dim MtbApp As New mtb.Application
Dim MtbProj As mtb.Project
Dim MtbCom As mtb.Command
[Code]....
what I'm expecting should happen is Minitab should open, and the command should execute. However, whats happening is that two instances of Minitab are being opened and neither are showing user interface, I have to find them in processes.
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Jul 18, 2009
Lets say i have a text box and i type picturebox.visible = false; then i press a button to execute it. and My Picturebox is not visible now.so How do i run that command since it was in a text box???
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May 14, 2012
Is there a way to execute SQL command for a Dataadapter rather than regular approach.
I i have parameters to pass to the SQLCommand. In he below model DAtaadapter at declaration itself we need to pass the SQL as string, and Conn. But i wan to send SQL Command to the adapter to execute instead command as string
Previously i have used to fill dataadapter as below
dbSource = "Database= DataBase;"
conn.ConnectionString = dbProvider & dbPassword & dbSource
If conn.State = ConnectionState.Open Then
[Code]....
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Aug 2, 2011
I am making a console application that will be prompted from a cmd. I want to be able inside my application to start an other program. Here is the line I am trying to use: %SystemRoot%Microsoft.NETFrameworkv4.0.30319MSbuild.exe /p:Configuration=Release test.shfproj This is making Sandcastle Help File Builder create a documentation with the test.shfproj i've builded previewsly.
[Code]...
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Feb 26, 2009
I am a C++ developer and completely new to Visual Basic so please excuse me if you find the question too dumb wrt a VB developer.I am porting a VB script to VB.Net. The VB script is using the following command :xecute(<variable containing more VB code>)Now, this command doesn't work in VB.Net and I am not able to find its equivalent in VB.Net ??
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Mar 11, 2011
I am a C++ developer and completely new to Visual Basic so please excuse me if you find the question too dumb wrt a VB developer.I am porting a VB script to VB.Net. The VB script is using the following command : Execute(<variable containing more VB code
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Sep 15, 2010
How can I execute a stored procedure using sqldatasource and get the return value in vb.net.
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Jan 29, 2010
I was rooting around in one of our company apps which is done in VB.net. I'm not familiar with VB.net (I do stuff in C#) so I'm asking this question: Does the code after the clean up comment execute? [code]It is my understanding once you say return, you give the calling function control again.
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Dec 16, 2009
I have an executable that I normally execute from cmd window. Now I want to write a vb program that does it, captures the output that the program would normally show on commandwindow and does some further stuff with it. Shell would be the starting point, I guess.
[Code]...
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Mar 2, 2011
I am working on a vb.net project and i have a "start" and "Pause" Buttons on the FormPost.exe
I am trying to schedule a batch process to run every day in the morning at 4:00 AM.
How can i run a command prompt to execuite FormPost.exe and them click on "start" button, all via command prompt?
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Sep 20, 2009
I know of the Shell method to run files, but how can I execute normal command prompt commands like nslookup, and capture the output as a string?
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Apr 21, 2011
I am trying to execute a shell command with vb.net that includes variable from the vb.net code.I have experience with batch, and Unix scripting. I had to modify the contents of the code as it is confidential to me at the moment.Example of my problem:
Dim Variable1 As String = "Location_to_.exe"
Dim Location As String = "UNC_Path_Goes_Here"
Dim Options As String = "/Options go here"
Shell("cmd.exe", /C Variable1, Location, Options) This is something that must be run from CMD.exe and I am trying to do it this way to make it as dynamic as possible.
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May 23, 2011
Lets just say we have this as Command1 Dim Command1 = "whoami.exe >> C:Hello.Txt" The program will read a list of users from a text file and then perform the action on each of them. If the user does not exist, or they are part of a password protected computer, I would like to see that in my printout. I have this but am Unsure how to write the If Then Statement (If that is the ebst route to take)
[Code]...
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Feb 19, 2010
I'm trying to send an HTTP command using VB.NET and I'm not quite sure how to do it. I don't want to actually navigate to the page, just execute the command.[URL]..
What I'm doing is building an integrated interface for my XBMC home theater, and my home automation.
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Jun 16, 2009
I need to convert a .tex file to a .dvi file (latex file), which I can do simply using a command in the cmd window: "latex C: est.tex" for example, would create the "test.dvi" file from the "test.tex" file.
I know how to start the cmd window (Process.Start("cmd.exe")), yet how to get VB to actually 'type' a message and execute it...
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Aug 6, 2009
Is there a way to "execute" a string variable as a command? [code]
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Nov 1, 2011
[code]...
What would be wrong in the above code. ExecuteReader is throwing excepion. Invalid cast from string to GUID. But My Sqlparamter was already uniqueidentifier nothing cast.[code]...
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Jan 21, 2012
I have some VB code like
Dim data As DataTable = DataAccess.ExecuteDataSet("AuthenticateWebServiceClient" _
, New SqlParameter("@ClientID", ClientId) _
, New SqlParameter("@Password", Password) _[code]....
Except PrepareSPCommand isn't recognized by VS. Does anyone know the correct way to convert this function to C#.
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Jul 12, 2011
I've done a little bit of LINQ but I almost exclusively return some elements from a collection based on some criteria. Now I'm trying to do something similar; let's say I have 50 winForm Controls in a collection - I want to set the .Visible property = True based on the controls name.
How would I do that? Below is my failed attempt.
myControls.AsEnumerable.Select( Function (myControl as Control) ( myControl.Visible = (myControl.Name <> "Hidden")) )
It compiles and even executes but does nothing.
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Sep 27, 2011
I am using ASP.NET
If I want to execute my Insert command from my SqlDataSource in my code behind I would do this.
SqlDataSource1.Insert()
But how would I be able to do this in JavaScript?
<script type='text/javascript' language="javascript">
function valSubmit() {
//Need to call the Insert Command here!
[Code].....
Where in my code behind can I place the Insert() command to make sure only after my valSubmit() function in JavaScript have executed it will then execute the Insert Command?
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Mar 16, 2010
I have been searching for a good code example that will place a small server program on my server and then allow me to use a client on my pc that will tell the server program to run a batch file on the server.
I thought this would be simple... I am finding it not that easy.
We have a server that users need to execute a command on however we do not want them to have login rights to the server so this will allow them to execute the batch file without having to log in.
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Jun 30, 2010
I'm using MVVM.
<ItemsControl ItemsSource="{Binding AllIcons}" Tag="{Binding}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
[Code]...
I'm able to capture the command. However, I want to execute the command binding when the mouse enters the stack panel, not when I click a button.
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