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The general rule of thumb is that anytime you call Dispose any unmanaged resources that were allocated are now unavailable so doing anything further with the object is risky. Since the object is kind of in an invalid state using the object beyond the Dispose.
It should also be noted that Dispose can happen independant of Object.Finalize. Dispose is an interface so an object can deallocate resources and not meant as the general "death of the object". There is a whole side topic of the GC that should be discussed outside of the thread if you really care.
My general practice is when I'm done with an object that has to manage limited resources, I call Dispose (I usually try to place this in a finally block) and then set it to null so if anyone "accidently" tries to reuse the object it will throw a NullReferenceException.
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Okay now i see it more clear. Cause im working with 2 mates and 1 always does null, the other allways do Close or Dispose, and when i asked what was the difference they didnt know what to answer me.
Ty for ur answers ppl.I appreciate ur help
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Hello.
I am trying to copy a worksheet in excel to an another worksheet.Let's say, I have an existing excel file(ExcelSablon.xls) and want to create a new excel file in a different name.
........
// Make an instance of Excel.
ExcelApplication excel = new ExcelApplication();
// Show Excel on the desktop. (fast = running in the background)
excel.Visible = true;
// Add a new workbook.
Workbook workbook = excel.Workbooks.Add(System.Type.Missing);
Workbook workBookSource = excelSource.Workbooks.Open(@"C:\TqmFiles\Templates\ExcelSablon.xls",missing,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing);
Worksheet workSheetSource = (Worksheet)excelSource.Sheets["Sheet1"];
Worksheet worksheet = (Worksheet)excel.ActiveSheet;
worksheet.Copy(workSheetSource,missing);
worksheet.SaveAs("C:\Temp\CopyOfExcelFile.xls", missing, missing, missing, missing, missing, missing, missing, missing, missing);
excel.Quit();
When I try to do this, it gives error in worksheet.Copy(workSheetSource,missing); statement.
Can anybody help me please?
Fatih Sen
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You need to indicate what error you're receiving, for starters. You should also indicate what the value of the 'missing' variable is (it should probably be something like Missing.Value).
Also, I assume you plan to further use Excel automation to do something with the worksheet you copied, otherwise why not just use File.Copy?
The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’
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Hey guys,
With the help of this forum I came a long way on my learning proces getting connected to the Active Directory.:->
With an example from the MSDN I managed to get an listing of all groups including the users in that group:
strPath = "LDAP://domainname"; <br />
<br />
Console.WriteLine("Bind to: {0}", strPath);<br />
Console.WriteLine("Enum: Groups and members.");<br />
<br />
try{<br />
objADAM = new DirectoryEntry(strPath);<br />
objADAM.RefreshCache();<br />
}<br />
catch(Exception ex){<br />
Console.WriteLine("Error: Bind failed.");<br />
Console.WriteLine(" {0}", ex.Message);<br />
}<br />
<br />
<br />
try{<br />
objSearchADAM = new DirectorySearcher(objADAM);<br />
objSearchADAM.Filter = "(&(objectClass=group))";<br />
objSearchADAM.SearchScope = SearchScope.Subtree;<br />
objSearchResults = objSearchADAM.FindAll();<br />
}<br />
catch(Exception ex){<br />
Console.WriteLine("Error: Search failed.");<br />
Console.WriteLine(" {0}", ex.Message);<br />
}<br />
<br />
try{<br />
if(objSearchResults.Count != 0){<br />
foreach(SearchResult objResult in objSearchResults){<br />
objGroupEntry = objResult.GetDirectoryEntry();<br />
Console.WriteLine("Group {0}", objGroupEntry.Name);<br />
<br />
foreach(object objMember in objGroupEntry.Properties["member"]){<br />
Console.WriteLine(" Member: {0}", objMember.ToString());<br />
}<br />
}<br />
}<br />
else{<br />
Console.WriteLine("Results: No groups found.");<br />
}<br />
}<br />
catch(Exception ex){<br />
Console.WriteLine("Error: Enumerate failed.");<br />
Console.WriteLine(" {0}", ex.Message);<br />
}<br />
Console.WriteLine("Success: Enumeration complete.");<br />
Console.ReadLine();<br />
}
This works great. I know it's possible to connect to a single group. I mean something like:
strPath = "LDAP://domainname/CN=Groupname,DC=domain***,DC=domain***";
When I execute the code he throws an exception saying:
"Object not found on server"
So i'm doning something wrong in the syntax-connection-string is guess.
This is the exact string I'm trying to use:
strPath = "LDAP://cu4it/CN=D_Company, CN=Users,DC=Cu4iT, DC=tld";
cu4it -> domainname
CN=D_Company -> The group I'm trying to connect to
CN=Users -> Don't know why, but find this in many examples
DC=Cu4iT, DC=tld -> retrieved from rootDSE.Properties ["configurationNamingContext"]
Can anyone tell me what I'm doing wrong here?
Thanks in advance!
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Hi,
Can anyone show me how to change the balance of an audio line!? I need the same function like the windows volume control pannel does.
If I change the balance in my program, I want should see teh change in the volume control pannel too.
How can I do this!?
Thx for help...
Daniel
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I have a DataGrid control which has some DataGridTableStyles. I want to bind an IList to one of these DataGridTableStyles without converting this IList to a table and assign the name of this table to the MappingName property of the DataGridTableStyle. How can I do?
Thanks!
ghghgj
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Hi,
the MappingName of the table style has to be set to the class name of the list class assigned to the data source. I dont know if IList is sufficient. If not take myList.GetType().Name as the mapping name.
The column style's mapping names then have to be set to the names of the properties you wish to show.
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could anyone plz kindly tell me how to select row from the datagrid and display them in Textboxes. so that i can edit them.
for eg;- datagrid has two column containing first name(John) and lastname(smith). i need to select them and display them in textbox 1 for displaying first name and 2 for displaying last name.
leo
Kathmandu, Nepal
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A simple example.
Suppose you have a dataSet that contains data from a couple of tables located in a Database. The following code snippet will loop through each of the records in the FIRST table of the dataSet and will display the values of the fields username and password, for each record (row). I know it's a silly example since it doesn't make a lot of sense to do something like that, but it demonstrates the way for accessing the rows in a table:
DataTable <code>dt</code> = dataSet1.Tables[0];
for(int <code>i</code> = 0; i < dt.Rows.Count; i++)
{
this.textBox1.Text.Trim() == dt.Rows[i]["Username"].ToString().Trim();
this.textBox2.Text.Trim() == dt.Rows[i]["Password"].ToString().Trim();
}
Hope this helps
Regards,
Polis
Can you practice what you teach?
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Good day to all of you, I'm an intermediate C# programmer, and I'm trying to help my friend who has a small computer rental for the monitoring of the pc use, mostly for gaming/internet. As of now, he is confined to writing all in a record book and do all by hand, so I want every computer to have a small window that has their time remaining before the computer logs off or hibernate, the workstations are being controlled by the server in the cashier. The problem is how can I access the workstations for me to control it in the server and to place small windows in them. Somebody told me that it can be done using winsock. This is my first time to handle a network related application using C#. Thanks in advance.
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You can probably do it with a quick script but...
If you want to use c# the fastest way is to create a client / server app using remoting.
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How can I get the hardware profile of remote computer?
I am working on a web application which check visitor hardware profile and display it on the web... I have the problem of how can I make it run automatically without troubling the user to download it and run it on local machine.
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I use this code to handle my event, but DoubleClick event not work.
Can some one help me?
thanks.
pictureBox.DoubleClick += new System.EventHandler(mouseDoubleClick);
pictureBox.MouseDown += new System.Windows.Forms.MouseEventHandler(MouseDown);
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hi, i have tested it and it works. here are the 2 lines of my code
this.pictureBox1.DoubleClick += new System.EventHandler(pictureBox1_DoubleClick);
this.pictureBox1.MouseDown +=new MouseEventHandler(pictureBox1_MouseDown);
Make sure u get the sender and event args and no exception is skipping ur code.
I made a pic box which changes the location on double click and changes image in mouse down , show the methods code to see whats wrong.
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Thanks for your answer.
there are my code it's a thumpnails image.
method doubleclick for open image.
and mousedown for dragdrop image to my other panel.
pictureBox.DoubleClick += new System.EventHandler(mouseDoubleClick);
pictureBox.MouseDown += new System.Windows.Forms.MouseEventHandler(MouseDown);
public void MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
PictureBox pb=(PictureBox)sender;
pb.DoDragDrop(filename,DragDropEffects.Copy);
}
public void mouseDoubleClick(object sender, System.EventArgs e)
{
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo.FileName=filename;
proc.Start();
}
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as topic, how to write a loading screen when my system is doing something like loading the sql statement, crystal report or datagrid?the loading screen will automatically show during loading, then it will automatically close when the loading is complete, anyone can provide some coding on this? ur help is greatly appreciated..;)
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I have a form which has more than 10 combobox controls and all should be filled from a different fields in different tables in one mySQL database. I want to do this using the code and not at design time because I have the connection setting in the registry.
what is the best way to do it (with example please) to make sure the form loadng won't be too slow..
Many Thanks,
Jassim Rahma
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Hi jrahma,
Get the rquired fileds from Database into a Dataset or data table. Set the Datasource , DataMember, Value member properties of the combobox control to the right columns in your dataset or table.
Thanks and Regards
SGS
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I have an MDI child for and I want it to be shown maximized with preventing the user from clicking on Max, Min or X buttons on the control box.
Jassim Rahma
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To show MDI child as maximized, set the "WindowState" property to the value of "Maximized".
If you do not want to show the Max button, set the "MaximizeBox" property to "False".
For not showing the Min button, set the "MinimizeBox" property to "False'.
Likewise, if you do not want to show the X button (i.e., close button) on the child form, you can set the value of "ControlBox" as "False".
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Hi Ashok,
I've tested your suggestion. But it still allows me to minimize the child form. Guess we need to do something more to prevent that.
Thanks and Regards
SGS
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There's the SizeChanged event that will tell you when the window size has changed (minimized or maximized.) There's not a SizeChanging event to cancel the resizing that I could find, but you could immediately re-maximize your window (I don't know about flicker.)
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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Use the following code (i.e., in the Load event of the Child form). It should solve your problem, as I could test in my sample program. This code will give you a child window with no Max, Mix, Close (i.e., X) buttons and with fully maximized child window, as desired by you. You can still access other child windows from the Window menu of the MDI Parent window which displays links to different child windows.
private void ChildWindow_Load(object sender, System.EventArgs e)
{
this.Dock = DockStyle.Fill;
this.FormBorderStyle = FormBorderStyle.None;
this.MaximizeBox = false;
this.MinimizeBox = false;
this.ControlBox = false;
}
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Ok , this time I think it is a logic error r smth... her eis the full code:
private void Tamam_Click(object sender, System.EventArgs e)
{
SqlCommand myCommand = null;
myCommand = new SqlCommand("INSERT INTO CES VALUES(@i_cesit,@i_uzunluk,@i_capı,@i_uzunlugu,@i_kavisi,@arayuz,@kod,@stok,@g_fiyat,@s_fiyat)",Form1.myConnection);
try
{
myCommand.Parameters.Add("@i_cesit",SqlDbType.VarChar);
myCommand.Parameters["@i_cesit"].Value = ıplık_cesıtı.Text;
myCommand.Parameters.Add("@i_uzunluk",SqlDbType.Int);
myCommand.Parameters["@i_uzunluk"].Value = ıplık_capı.Text;
myCommand.Parameters.Add("@i_capı",SqlDbType.VarChar);
myCommand.Parameters["@i_capı"].Value = ıplık_capı.Text;
myCommand.Parameters.Add("@i_uzunlugu",SqlDbType.Int);
myCommand.Parameters["@i_uzunlugu"].Value = (ıgne_uzunlugu.Text);
myCommand.Parameters.Add("@i_kavisi",SqlDbType.VarChar);
myCommand.Parameters["@i_kavisi"].Value = ıgne_kavısı.Text;
myCommand.Parameters.Add("@arayuz",SqlDbType.VarChar);
myCommand.Parameters["@arayuz"].Value = ara_yuzu.Text;
myCommand.Parameters.Add("@kod",SqlDbType.VarChar);
myCommand.Parameters["@kod"].Value = urun_kodu.Text;
myCommand.Parameters.Add("@stok",SqlDbType.Int);
myCommand.Parameters["@stok"].Value = (stok_mıktarı.Text).ToString();
myCommand.Parameters.Add("@g_fiyat",SqlDbType.Float);
myCommand.Parameters["@g_fiyat"].Value = (bırım_fıyatı.Text);
myCommand.Parameters.Add("@s_fiyat",SqlDbType.Float);
myCommand.Parameters["@s_fiyat"].Value =(bırım_fıyatı.Text); myCommand.ExecuteNonQuery();
}
catch (Exception a)
{
MessageBox.Show(a.ToString());
}
}
It keeps giving an error like :
"System.FormatException: Input string was not in a correct format.
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at CES.urun.Tamam_Click(Object sender, EventArgs e) in c:\documents and settings\şirin baba.aikanaro.002\desktop\ces\urun.cs:line 587"
o.k , what can be the problem , according to the articles found in net , there is nor mistake.. Has any one any idea?
Thanks a lot..
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