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I believe conversion from double to string is a widening conversion and thus can be done implicitly.
Anyway, your point about the there and back again conversion is right. I was more focused on solving the stated problem than watching what I copy-pasted.
The input should be validated beforehand, but this there-and-back-again method does avoid some SQL injection-like vulnerabilities.
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Your code has SQL injection written all over it, though I'm not sure how protective the DataView is (i.e. whether it passes that filter through to any database level processor where it could do real damage). Even if it protects you in this instance, get into the habit of escaping anything you put in a query string (and that's what that filter string is).
I agree with MicroVirus that you probably want the account to be an int and use =. With double you can use int or you can use (AccountNo>=value-delta) AND (AccountNo<=value+delta) where delta is a comparison tolerance value which you should pick.
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thanks for Your Replies ,
AccountNo is 13 digit , so i prefer to use to double ,
As i said , I want to Filter AccountNo , when i write "1" in the TextBox , and in the Result all of Records display that begin by "1" , when I write "2" after "1", display all Records begin "12" and etc.
Thanks !
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Okay, to do that kind of string filtering you will need to store the ID as a string (or write a query with a conversion, but that's probably slow). This will prevent you from doing arithmetic on that column and, depending on your database, might be slow as a primary key, so you might want to have a separate column with a string version in it.
For large integers you should use long, not double.
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As BobJanova said, this kind of code leaves you wide open to SQL injection attacks...
You might want to take a look at http://bobby-tables.com/[^] (Yes, it's funny, but it's also important)
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The AccountNo field has a type of double in your database, which cannot be used with the 'like' operator. There are some solutions to this problem.
1. Change the type of AccountNo to text.
-or-
2. If you really want to use double for AccountNo, convert it to text in the query so that you can use the 'like' operator. The function to do the conversion may be different from one database engine to another. For example, in MySql, the function is 'cast', so something like this can be used:
string strFilterAccount = "cast(Accountno as char) like '" + Convert.ToDouble(txtAccount.Text) + "%'";
Considering that in many occasions an account number can really have letters and other non-digit characters in it, I think solution 1 may be better for you. (My water bill account number has letters and dashes embedded in it, for example)
SQL injection is a real issue here.
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Thanks ,
apparently , There No solution for AccountNo , Unless I Change the DataType to Text .
But , if I define AccountNo to a Numeric DataType , Really , There is no solution for it.
By the Way wat is the equel of the "Cast" (in MySql ) for Sql . if we Use Cast , we get this Error !
The expression contains undefined function call cast().
Thanks a Lot !
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If you are using Microsoft Access, the function to use is str(), like so:
string strFilterAccount = "str(Accountno) like '" + Convert.ToDouble(txtAccount.Text) + "%'";
SQL Server recognizes the 'cast' function. Please tell us what system you are using.
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my DataBase is MsAccess , in spite of this , i get this Error !
The expression contains undefined function call str().
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Sorry about the confusion. I was thinking that you were using a command object. Instead, you were using a DataTable. In this case, the function to use is 'Convert', like so:
string strFilterAccount = "CONVERT(AccountNo, 'System.String') like '" + Convert.ToDouble(txtAccount.Text) + "%'";
Hope this solves your problem.
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how to transfer file from computer to terminal (windows-mobile) Through FTP
thanks in advance
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I developed one website for my product.So now i would like to add some indian payment gateway API for the selling of my product through CC/Debit Card/Netbanking system.could anyone plz assist me for making that integration in to my site or please refer me some links on the same...
Thanks in Advance..
Srikanth P
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You will probably need to contact the site that provides the gateway in the first instance.
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hi
i transfer file from A to B Through WebService
after the was transfer i need to read his size.
i know how to do it, but when i try to read the file size i get:
The process cannot access the file XXX.XXX because it is being used by another process
what i can do ?
thanks in advance
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Without knowing how your code works, we can only guess at the methods you used.
However, this kind of error normally comes up because the objects you created to access and copy the file have not been properly released, and are waiting for the Garbage Collector to come in and free them. The file will remain in use until that happens.
Look at your file transfer code, and call Dispose on all your objects rather than just letting them go out of scope.
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
Manfred R. Bihy: "Looks as if OP is learning resistant."
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Assuming you've copied the file, are you sure it's being copied synchronously and the operation completed?
If you're using some sort of stream writer to write the data into the new file, you need to make sure the stream has been flushed/closed/disposed.
As for disposal, the same goes for any other instances you've created that implement IDisposable. If you can (if they're not used further down the line), make sure that they are disposed (with a using statement or calling the Dispose method).
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Did you mean to post that to me? 
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
Manfred R. Bihy: "Looks as if OP is learning resistant."
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Of course he did... you obviously need the help :P
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Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
Manfred R. Bihy: "Looks as if OP is learning resistant."
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I have a C#.net winform project which uses few libraries which are also created by me. Now I am creating a COM wrapper and want to use the same libraries from an excel file through VBA. But I do not want the excel to create a new instance of the libraries. I need to use the same instance of the libraries which are loaded by the winform prject. Please suggest a way.
Thanks in advance.
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When you create a COM Callable Wrapper (CCW), the mscorlib acts as the COM Server. The .NET runtime creates exactly one CCW for a managed object, regardless of the number of COM clients requesting it. Multiple COM clients can hold a reference to the CCW, which in turn, holds a single reference to the underlying managed object.
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Agreed. But the Winform application does not use the libraries through COM server.
WinForm App
|- Library1.dll
|- Library2.dll
.
Excel
|-ComWrapper
|-Library1.dll
|-Library2.dll
I have tried to explain the current situation digramatically. In the above case two instances of Library1.dll and library2.dll will be created as they are called from different processes. I need to have just one instance of library1.dll and library2.dll in the memory.
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Looks like an outproc COM server. That is your programs would communicate with a .exe instead of loading a .dll.
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