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Hi All,
I am using C# 2.0. I have a form with few controls such as Panel, TextBox, ListBox, GridView and etc. I am trying to resize all the controls in runtime when user resize the form by dragging form borders and I am doing this by setting Anchor property of all the controls to all sides (right,left,top,bottom) and the Dock property = None. Everything works fine ,but if I set form property AutoScroll = true then controls doesn’t resize. Any idea why? Please help.
Thanks in advance!
A.Asif
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BEcause it scrolls instead of sizing ?
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I have an application that needs to record data in a database and the particular date when that data was written to the database. More, I need customers to be able to retrieve data from the database by date or date range. To that end, the MS Access database I'm using has a field called TestDate of type Date/Time, and I set up two date/time pickers to allow customers to select a date or date range from which to get data.
All this works well and good until I change my regional/language options so the date format changes, say from mm/dd/yyyy to dd/mm/yyyy. Then, although the MS Access database updates the TestDate data automatically to reflect the change in date/time format and my date/time pickers in the C# appilcation reflect the altered format, the result of executing SQL statements based on the date/time pickers does not return the correct data from the database.
Rather, selecting all data from December 10, 2007 retrieves data from October 12, 2007. By contrast, if I select, say November 29, 2007, the correct data is returned. Something, then, is getting confused about ambiguous dates.
Any suggestions would be appreciated.
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You are storing using DateTime fields from the textboxes aren't you, rather than using a string? More importantly, you are using a parameter to put the field into the database aren't you?
If you want to force a UTC date, then you use the U format qualifier with the DateTime. For example
DateTime dt = DateTime.Now;
Console.WriteLine(dt.ToString("U"));
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Yes, I am using a parameterized query to insert new records into the database and storing the data using the DateTime data type rather than a string.
Still, somewhere between picking the datetime for the SELECT statement and retrieving the data from the database, the date time format gets lost in translation. If I select a non-ambiguous date such as 13/09/2007 (September 13, 2007), execution of the SQL command returns the correct data, but selecting an ambiguous date, such as 3/12/2007 (intending December 3, 2007) returns erroneous data. The report shows 12/3/2007 (March 12, 2007), but the value of the date prior to the execution of the SQL statement is 3/12/2007 (December 3, 2007).
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Hi, I'm learning C# by lurking the forums, but have much experience in Access. This solution works in Access, and I think it will work in C# but haven't tested yet.
In an Access query you have to enclose the date in # to force american date format.
This is how I do this (In Access)
Function ScriptaUDF(Datum As Date)
ScriptaUDF = "#" & Trim(Str(Month(Datum))) & "/" & Trim(Str(Day(Datum))) & "/" & Trim(Str(Year(Datum))) & "#"
End Function
So whenever I need a date in a query I use:
where (((Table.datefield) = " & ScriptaUDF(Me!Datefield) & "))
I hope this helps
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That's interesting. The problem I've been having occurs, seemingly, during the execution of the SQL statement. I enclose my SQL SELECT statements with a # sign currently, so
"SELECT * FROM Table WHERE Date BETWEEN #" startdate #" AND #" endate"
If the # character forces an American date format, that would explain much, I think.
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How would I specify a date in a SQL expression without forcing the american date format? Is there something I can use to insert a date in the SQL query without using the # sign? Or, if I use the # sign, can I simply force the format that is needed?
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I found a solution. Basically, the Jet Engine seems to have problems with translation. To get the correct data, I have to do this:
SELECT * FROM TABLE WHERE Date BETWEEN Format(#" + startDate + "#,'mm/dd/yyyy')AND Format(#" + endDate + "#,'mm/dd/yyyy')
By setting the format in the SQL statement to United States format, the data seems to come back to me correctly.
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If I have a text file containing the first line like this:
John 1976 200,000 United States
How do I import it to the database specifying that the first column should be John, second is 1976, third is 200,000, and last column is United States?
What are the commands/syntax being used to achieve this? Thanks.
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Your text file format is a disaster. So long as country is the only field that can have a space in it, you may be OK. You use the string.Split method to turn this into a string array. If there's a fifth or sixth element, you append those to the fourth ( that's the country ). Then you have values to stuff into the database.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Thanks. How do we use bcp or bulk insert to import the data in text file into the database? I haven't done anything with databases or ADO.Net so I might need some step by step procedure to do this.
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In that case, I'd recommend going through an article on the topic, on this site or elsewhere. It's just going to cover things in far more depth and clarity than I can hope to do in a forum reply.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I answered a question a few posts ago, where a user thought that assigning reference types was creating aliases for the names of those types. After thinking about it, I began to wonder if there IS a way to do this, so that you have two instances referencing the same pointer to the object. For example, is there a way to do the following in C# (I doubt it, because it was often the cause of many problems in C++, but just thought I would ask)?
object A = new object();
object B = ref A;
B = new object();
Hope this question makes sense. Thanks,
Sounds like somebody's got a case of the Mondays
-Jeff
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Hi Jeff,
I have never seen such thing, so AFAIK it is impossible.
Also, IMO the C# language designers would consider it unnecessary and unsafe.
And if you look at pointers, they can only point to value types.
So I think you will have to refactor the code and substitute every B by A.
[added]
the feature you're asking about is similar to the union in C/C++;
it is not supported in C#, although there is a way to mimic it inside structs,
by giving explicit FieldOffset values
I use unions (in C that is) only to byte-convert from one type to another, not to get two names for
the same thing; sometimes I miss it in C#. Not sure how the C# compiler would cope with the latter.
[/added]
modified on Tuesday, December 11, 2007 2:49:59 PM
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Yeah, I remembered doing it in C++ before, but couldn't remember what the keyword was. I don't really have a need (nor see a need) to do this, since, as you said, I could just substitute the variable A for all occurances of B and still have identical code. This is a feature that I think should NOT have been implemented in C#, so I am glad to see that it isn't. Thanks Luc,
Sounds like somebody's got a case of the Mondays
-Jeff
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After googling for a while, I determined that the code I was refering to in C++ would have looked something like this (I think)...
int i = 0;
int j = &i;
j = 5; I think that the previous code forces i and j to always be equivalent, but again, it has been a while since I programmed in C++, so I can't be certain. Thanks,
Sounds like somebody's got a case of the Mondays
-Jeff
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Skippums wrote: int j = &i;
that would not compile, it should be int* j = &i; so there is only a single
int, and a pointer that now points to the same int. So changing it either with i=...
or with *j=... results in changing the single int, whatever way you access it,
it is still a single variable.
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I was wondering if there is a simple number format code for if you only want to see the decimal portion of the number if there are any significant digits to the right of the decimal - otherwise show the number as an integer.
ex. 3.5 -> 3.5 and 3.0 -> 3 (instead of 3.0)
Thanks
Brent
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Use something like:
num.ToString("0.#")
This will display the string representation of the number including the first significant digit to the right of the decimal point if required.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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I have an app that connects to a db in the Data Directory for Website Project. I am able to connect to the database fine locally. However, after I uploaded my project to my hosting provider's server and try to process a form that does a sql insert, I receive the following error:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure my be caused by the fact that under the default settings SQL server does not allow remote connections. (provider: Sql Network Interfaces, error 26 - Error Locating Server/Instance Specified.
My connection string to the datasource is as such in my webconfig file:
connectionString="DataSource=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|DefinaBackEnd.mdf;IntegratedSecurity=True;ConnectTimeout=30;User Instance=True"
and the call to the connecting string is called as such:
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefinaBackEndConnectionString"].ConnectionString);
conn.Open();
Can someone please assist with how to resolve this as this site just looks for a sql db file as opposed to an instance of sql server itself. Thanks to all in advance.
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Hi, let's take this piece of code:
Engine newEngine = new Engine(200, "PS");
Engine oldEngine = null;
oldEngine = Car.Engine;
Car.Engine = newEngine;
...
Car.Engine = oldEngine;
If Engine is a class (reference type), shouldn't oldEngine share the same value like newEngine? Right now they have different values.
regards
modified 12-Sep-18 21:01pm.
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No... Basically, the variables are pointers to objects (ie, addresses). Therefore, your code does the following:
Engine newEngine = new Engine(200, "PS");
Engine oldEngine = null;
oldEngine = Car.Engine;
Car.Engine = newEngine;
...
Car.Engine = oldEngine;
Therefore, newEngine IS NOT equal to oldEngine or Car.Engine, but the other two are equal. Hope this helps,
Sounds like somebody's got a case of the Mondays
-Jeff
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Let's say I have an assembly whatever.dll. I have an app where I want to load that assembly dynamically at runtime (it implements an interface that I know about already) and all I have to go on is the filename. If I do this:
<br />
Assembly assembly = Assembly.LoadFrom(@"C:\somecrazypath\bin\Debug\whatever.dll");<br />
foreach (Type type in assembly.GetTypes())<br />
{<br />
if (type.GetInterface("IMyInterface") == null)<br />
{<br />
continue;<br />
}<br />
<br />
object ibaseObject = Activator.CreateInstance(type);<br />
LoadedModules.Add((IMyInterface)ibaseObject);<br />
}<br />
Then it works great. I can handle events from the object in whatever.dll, and I have a reference to it that works as expected. However, that doesn't allow whatever.dll to have it's own config file, which is also a requirement. So in doing some research, it seems that if you load an object in it's own appdomain, then it can have it's own app.config (read here). So that seemed perfect, but the problem is that I just can't get the code to load right. If I do this:
<br />
AppDomainSetup ads = new AppDomainSetup();<br />
ads.PrivateBinPath += @"C:\somecrazypath\bin\Debug\";<br />
ads.ApplicationBase = @"C:\somecrazypath\bin\Debug\";<br />
ads.ConfigurationFile = @"C:\somecrazypath\bin\Debug\whatever.dll.config";<br />
AppDomain ad = AppDomain.CreateDomain("Whatever", null, ads);<br />
byte[] _assembly = loadFile(@"C:\somecrazypath\bin\Debug\whatever.dll");<br />
ad.Load(_assembly);
I get a filenotfound exception stating that it could not find whatever.dll or one of its dependencies. For the purposes of testing, I made sure that whatever.dll does not have any dependencies (no references other than System, System.Configuration, System.Data, and System.Xml) and I had it inherit MarshalByRefObject instead of my base class to eliminate that as a possible problem. I'm really at a loss as to why it can't seem to find the file. From reading online, it seems that the problem is because it is in a different path than the currently running appdomain, but I would have expected that setting the privatebinpath and the applicationbase on the new appdomain should have fixed that. I did find another report of the same problem here but the answer is incorrect. Passing the full path\filename to createinstanceandunwrap doesn't really fix it.
Has anyone run into this problem before?
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I did just check, and I can load the assembly to the new appdomain just fine if I also place a copy of it in the running application's applicationbase directory. This works even if I don't change the absolute path I use to load whatever.dll. So it seems that if the dll is available to the current appdomain, then I can instance it in a new appdomain as well, but not if it is in a different directory.
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