Develop Reference

The process cannot access the file 'filename' because it is being used by another process

I am new in C# and I have a problem connecting to a Firebird database. I want my program to access a Firebird Database [FDB format file]. I have problem, see the code below:
File.Copy(pathway, new_pathway, true);
FbConnection addDetailsConnection = new FbConnection("User=sysdba;Password=masterkey;Dialect=3;Database= " + new_pathway +
";DataSource=localhost;" );
string SQLCOMMAND = " SELECT UOM FROM ST_ITEM_UOM WHERE CODE = 'ANT'";
addDetailsConnection.Open();
FbCommand readCommand = new FbCommand(SQLCOMMAND, addDetailsConnection);
FbDataReader myreader = readCommand.ExecuteReader();
while (myreader.Read())
{
MessageBox.Show(myreader[0].ToString());
}
myreader.Close();
readCommand.Dispose();
addDetailsConnection.Close();
addDetailsConnection.Dispose();
This code lets me read my FDB file and extract the data. When the code executes for the first time, there is no error or problem, However when when I execute it again, this error is shown:
The process cannot access the file 'C:\Users\ACC-0001.FDB' because it is being used by another process.

You can use Handle to check which program is locking the file. It might be caused by your code or by another process running on your machine.
The tool identifies the process, for example:
C:>handle.exe c:\test.xlsx
Handle v3.46 Copyright (C) 1997-2011 Mark Russinovich Sysinternals -
www.sysinternals.com
EXCEL.EXE pid: 3596 type: File 414: C:\test.xlsx
As found here.
If the problem lies within your code, make sure you dispose and close all connections, preferably by using them within using sections:
using (FbConnection addDetailsConnection = new FbConnection("..."))
{
// do work
}
More details on using using can be found here.

You might have bumped into this Firebird issue: FB server reports that DB file is used by another application on secondary attachment attempt through a symlink
It only happens on Windows and only when two non-embedded connections use different path names of which one or both have a symlink in their path so they effectively point to the same location.
Both handle.exe and Process Explorer will only show the canonical (final) filename that fbserver.exe actually opens.
The only way to find out is to:
compare connection strings.
verify with handle.exe or Process Explorer that the files are indeed opened by fbserver.exe (and not by your process itself using an embedded connection)

asp.net c# connecting to putty ssh and running a command line like status

ok folks i have seen alot of questions about this but none that i can use or understand
What i am attempting to do is connect to putty from asp.net c# and then run a command to get the status
i will then use the results to draw a report every 3 seconds and display it on my web page
this is the first time a have attempted this so i am rather ignorant
private void connect_putty()
{
Process sh = new Process();
sh.StartInfo.FileName = "Putty.exe";
sh.StartInfo.UseShellExecute = false;
sh.StartInfo.CreateNoWindow = false;
sh.StartInfo.Arguments = "";
}
what i presently have which to be honest is pathetic any help will be appreciated
Thanks in advance

I would suggest using Tamir.SSH.
This will allow you to do everything from C#.
Also, I wrote some code once, it may help you.
https://github.com/daneb/Push2Linux/blob/master/Form1.cs
Sample:
SshShell ssh; // create our shell
ssh = new SshShell(aHost.host, aHost.username, aHost.password);
// Command Output
string commandoutput = string.Empty;
// Remove Terminal Emulation Characters
ssh.RemoveTerminalEmulationCharacters = true;
// Connect to the remote server
ssh.Connect();
//Specify the character that denotes the end of response
commandoutput = ssh.Expect(promptRegex);

PuTTY includes all the terminal emulation (hence the name), so assuming you mean 'connect via ssh', instead of the putty app specifically, then SSH.NET and SharpSSH are 2 good choices.
See this related question: C# send a simple SSH command

Run powershell from c# most efficient way to create multiple mailcontacts in Exchange Online

I wish to create multiple mailcontacts (external Contacts) in the GAL in Microsoft Online by running Powershell command from C#. The code below works, but is very slow and takes about 15-20 min to run for 400 mailcontacts.
foreach(EmailAdressVM emailAddressVM in emailList.emailAddresses1)
{
//Create New MailContact.
Pipeline pplNewMailContact = runspace.CreatePipeline();
Command cmdNewMailContact = new Command("New-MailContact");
cmdNewMailContact.Parameters.Add("Name", emailAddressVM.sExternalEmailAddress);
cmdNewMailContact.Parameters.Add("Displayname", emailAddressVM.sFullName.Trim());
cmdNewMailContact.Parameters.Add("Lastname", emailAddressVM.sLastName.Trim());
cmdNewMailContact.Parameters.Add("Firstname", emailAddressVM.sFirstName.Trim());
cmdNewMailContact.Parameters.Add("ExternalEmailAddress", emailAddressVM.sExternalEmailAddress.Trim());
pplNewMailContact.Commands.Add(cmdNewMailContact);
pplNewMailContact.Invoke();
pplNewMailContact.Stop();
pplNewMailContact.Dispose();
}
I am guessing that this is slow since I create a new Pipeline for every new mailcontact that is added and there has to be a more eficient way of doing this since running...
import-csv <filename> | ForEach {
new-mailcontact -name $_.emailaddress -displayname $_.FullName -lastname $_.lastname -firstname $_.firstname -externalemailaddress $_.emailaddress -alias $_.alias
}
...is much faster.
I have found some references after many hours of searching the web that you can do something similar to using a CSV when running Powershell commands from C#, i.e. send a list (or array) of values to a command (in this case the "new-mailcontact" command). But, I have not found any good example of how to send more than one value to a command and I need to supply many values (for example: -name $.emailAddress -displayname $.FullName, etc.) to the "new-mailcontact" command.
Is it possible to send a list (or array) in a similar way as the "import-csv" command (when using regular powershell) and will this be faster, or is there an evan better way? Would I get better performance if I use Powershell 3 instead of 1 (as I am using now).
Please provide working sample code i C#!
Please note that I cannot save a CSV file to disk and the execute powershell from CMD since I do not have write access to disk and that I do not think that I can run an entire script remotely (since remote scripting probably is disabled on Exchange Online).

The biggest reason I would think is because for each address you are creating a new Powershell instance and you are not multithreaded.
You code looks something like this from above:
Foreach email address{
Declare a new Powershell process
Add attributes to call later
Start Powershell and pipe stuff in
Close Powershell instance
}
I think you would be better off creating the Powershell instance / pipe once and then sending each object into it. More along the lines of:
Create PS Pipe
Foreach email address{
PS.SendArguments(Email, Name, DN, etc.);
}
I am not in an environment to get something working or tested right now, so hopefully this gives you at least most of what you need...

c# to AS400 / JD Edwards - run program - Data source name not found and no default driver specified

UPDATE: The code example below works. I changed the connection string. That was the problem. For an alternative (non-ADO) solution, see Mike Wills's link in the comments.
I have a c# class that (if I ever get it working) runs a program written in RPG code on AS/400 - JD Edwards. I know next to nothing about AS/400 and/or JD Edwards.
I've got other classes in my (intranet) web app that connect to JD Edwards, running SQL queries and setting/getting data. All of these are using the IBM.Data.DB2.iSeries dll and are working great.
For this, I wrote a similar class using the aforementioned dll, but it wasn't working. I even read somewhere online that you can't run a program using this dll. I found that a little fishy, but on suggestion from my JD Edwards co-worker, I scrapped the class and re-wrote it using the adodb dll. No data need be returned from this program run. I just want the program to run.
Here is a dummified version of the class:
private void runJDEProgram() {
ADODB.Connection cn = new ADODB.Connection();
cn.ConnectionString = "Provider=ABABAB;Data Source=111.111.111";
ADODB.Command cmdDetail = new ADODB.Command();
cn.Open(); //has to be open before setting an active connection.
cmdDetail.ActiveConnection=cn;
cmdDetail.CommandType = ADODB.CommandTypeEnum.adCmdText;
cmdDetail.CommandText = "{{CALL BLAH.BLAH(?,?)}}";
cmdDetail.Prepared = true;
cmdDetail.Parameters.Append(cmdDetail.CreateParameter("P1", ADODB.DataTypeEnum.adChar, ADODB.ParameterDirectionEnum.adParamInput, 10, "BLAH123"));
cmdDetail.Parameters.Append(cmdDetail.CreateParameter("P2", ADODB.DataTypeEnum.adChar, ADODB.ParameterDirectionEnum.adParamInput, 10, "BLAH456"));
object dummy = Type.Missing; //otherwise, we couldn't get past this.
cmdDetail.Execute(out dummy, ref dummy, 0);
cn.Close();
}
Here's the error I get when it runs:
{"[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified"}
Where am I screwing up? Thanks!
EDIT: The connection string works when querying the AS/400 to get/set data. Does it need to be modified for an operation like this, or for use with ADO?

The connection string has to be different for this, for some reason. I don't use the same connection string for the other classes that just run queries. The above connection string worked fine (with the appropriate values, of course).
It will prompt for password, but the JDE folks here wanted that.

Run a Remote Powershell Script on a Different Remote Server in a C# Runspace

I need to be able to execute a PS1 script that resides on a remote machine against another remote machine through a C# runspace.
To be clear what I mean by this: The service I'm creating resides on server A. It creates a remote runspace to server B using the method below. Through the runspace I'm trying to call a script residing on server C against server B. If it helps, currently server A IS server C, but it's not guaranteed that will always be the case.
Here's the method I'm using to make the remote call:
internal Collection<PSObject> RunRemoteScript(string remoteScript, string remoteServer, string scriptName, out bool scriptSuccessful)
{
bool isLocal = (remoteServer == "localhost" || remoteServer == "127.0.0.1" || remoteServer == Environment.MachineName);
WSManConnectionInfo connectionInfo = null;
if (!isLocal)
{
connectionInfo = new WSManConnectionInfo(new Uri("http://" + remoteServer + ":5985"));
}
PsHostImplementation myHost = new PsHostImplementation(scriptName);
using (Runspace remoteRunspace = (isLocal ? RunspaceFactory.CreateRunspace(myHost) : RunspaceFactory.CreateRunspace(myHost, connectionInfo)))
{
remoteRunspace.Open();
using (PowerShell powershell = PowerShell.Create())
{
powershell.Runspace = remoteRunspace;
Pipeline pipeline = remoteRunspace.CreatePipeline();
pipeline.Commands.AddScript(remoteScript);
Collection<PSObject> results = pipeline.Invoke();
remoteRunspace.Close();
scriptSuccessful = myHost.ScriptSuccessful;
return results;
}
}
}
"remoteScript" is set to the Powershell script I want to run. For example:
"& \"\\\\remoteserveraddress\\PathToScript\\Install.ps1\" -Parameter;Import-Module Modulename;CustomCommand-FromModule -parameter(s) -ErrorAction stop"
If I'm on the remote machine that I want to run the script on, in the powershell console I can just give the following command:
& "\\remoteserverC\PathToScript\Install.ps1" -Parameter
However this simply refuses to work for me if I try to run it through the c# runspace.
If I send in the following as a parameter to "remoteScript":
"& \"\\\\remoteserverC\\PathToScript\\Install.ps1\" -Parameter"
I get the following error:
The term '\remoteserverC\PathToScript\Install.ps1' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
I've tried with and without '&' and with and without the parameter. I can already call a script that resides directly on the remote machine "c:\...\Install.ps1" instead of "\\remoteserver\...\Install.ps1", but it would be greatly beneficial to be able to call the remote script directly.
I've searched many many pages in google and here on stackoverflow, but I haven't been able to find anything that helps to overcome this issue. Any help would be appreciated! Thanks!

I never did get this to work directly and seems to be a security "feature" that you can't access a third machine using a UNC address while working remotely. I was however able to find a workaround that worked great for me.
Instead of trying to call directly to a \\server\share address, I dynamically map a network drive on the machine I'm trying to run the script against to a share on the machine that has the script. (Running remotely from A, map a drive on B to a share on C). Then I call my scripts through that drive and it works like a charm. This string is what I pass in to the RunRemoteScript method above:
"$net = new-object -ComObject WScript.Network;" +
"if(!($net.EnumNetworkDrives() -contains \"S:\"))" +
"{Write-Host \"S: Drive Not Currently Mapped. Mapping to \\\\" + RemoteServerC + "\\Share.\";" +
"$net.MapNetWorkDrive(\"S:\",\"\\\\" + RemoteServerC + "\\Share\",$false,\"username\",\"password\")};" +
"Get-PSDrive | Write-Verbose;" +
"& \"S:\\PathToScript\\Install.ps1\" -noPrompt;"
RemoteServerC is a variable I pass in that is defined in a user config file.
Here is the same code as just powershell script if anyone needs it (replacing RemoteServerC with a powershell variable you'd need to set before or just hardcode:
$net = new-object -ComObject WScript.Network
if(!($net.EnumNetworkDrives() -contains "S:"))
{ Write-Host "S: Drive Not Currently Mapped. Mapping to \\remoteserverC\Share."
$net.MapNetWorkDrive("S:","\\remoteserverC\Share",$false,"username","password")
}
Get-PSDrive | Write-Verbose
& "S:\\PathToScript\\Install.ps1\" -noPrompt;"
First I set up the object to be able to map the drive. I then check if there is already an "s" drive mapped on the remote machine. If it hasn't I then map the share to the "s" drive on the remote machine using a name and password we set up in active directory to run this service.
I included the Get-PSDrive command because it appears to force powershell to reload the list of available drives. This seems to only matter the very first time you try to run this in a powershell session (and through c sharp I don't know if it is truly necessary or not, I included it to be safe). Apparently powershell does not recognize a drive addition in the same session it was created if you use MapNetworkDrive.