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how to use StreamReader in C# to read only entries over a specific length to a list? [closed]

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when using StreamReader in C# to load a txt file into a list, i assume that using a simple "If" the string's length is over a particular length, it will add it to the list. can anyone provide C# code for this? this IS homework, but it's NOT a C# class. the instructor would gladly provide this if i asked this specifically. thx.
the txt file is a dictionary of ~280,000 words, one per line. very simple move to turn into a list, but i'm wondering about getting words at least 2 characters long.

Just use LINQ to give you a subset.
List<string> lines = File.ReadLines(filename)
.Where(l => l.Length > specifiedWordLength)
.ToList();

multiple checks for file extension [closed]

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I have property which holds filenameOnly without extension.
string fileNameOnly = "myFileName";
now I want to perform multiple checks on selected location for example c:\ for existed filename+fileextension (.jpg, .png, .gif, .bmp)
so, if c:\myFileName.jpg exist than assign that value to string filename="myFileName.jpg" variable.
what is the best and quickest way to do this?

Try something like this to get an array of files that fit your pattern:
string[] files = Directory.GetFiles(
DirectoryPath,
String.Format("{0}.*", fileNameOnly));

Correct way to parse a String to DirectoryInfo? [closed]

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I'm working on a program and to avoid complication I need to parse a given string variable to be a DirectoryInfo.
I was wondering if it were possible to parse a string to a DirectoryInfo.
If it is, how does one go about doing that?
Thanks

DirectoryInfo di = new DirectoryInfo(string);
MSDN, linked above, provides you the exceptions in case the string is invalid. Note: this is NOT if the directory exists. MSDN also makes note of this in the Remarks. You must then do:
if(di.Exists)

Well, it's not parsing, but the constructor for DirectoryInfo takes the path as a string:
DirectoryInfo di = new DirectoryInfo(#"c:\MyDir");

.Net how to play audio in the root of the website with System.Windows.Media.MediaPlayer() [closed]

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I use this code blow in .NET. It works fine. The problem is that I want this audio to play in the root of the website. What changes should I make for this? Thanks
var sample= new System.Windows.Media.MediaPlayer();
sample.Open(new System.Uri( #"D:\voices\1.wav");
sample.Play();

In a web application, this might look something like this:
sample.Open(new System.Uri(Server.MapPath("~/") + #"\voices\1.wav");
I say might because that all depends on whether or not the voices folder exists in the root of the website. Additionally, you should probably leverage Path.Combine instead:
var path = Path.Combine(Server.MapPath("~/"), "voices", "1.wav");
sample.Open(path);
Finally, I don't know what sample is, but the Open method may not work in a website. I'm making the assumption you know what Open does and whether or not it can work in a website.

Use server.mappath("~/") <- that's the filesystem root for your website.
dim path as string = server.mappath("~/") & "/voices/1.wav"
Note that backslashes, for filesystem path, not URI.
Hope it helps.

Directory structure - what path should I use? [closed]

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I have created a WindowsApp.exe under Application\Setup folder. Now I want to create a Database under Application\Database folder from WindowsApp.exe
What should be the path given to the filename here?

try
Path.Combine(Environment.CurrentDirectory, "Database\\db1.mdb")
Edit
since you want the parent folder you can go up one folder by doing
Path.Combine(Environment.CurrentDirectory.Substring(Environment.CurrentDirectory.LastIndexOf("\\")), "Database\\db1.mdb")
Edit 2
if you want the Application folder even if its N times above the current folder then you can reach it by doing this
var index = Environment.CurrentDirectory.IndexOf(Environment.CurrentDirectory.IndexOf("ApplicationRootFolderName"),"\\")
var AppRootPath = Environment.CurrentDirectory.Substring(0,index);
Edit 3
As mentioned by Michael its better to get the parent folder using this way
Directory.GetParent(Environment.CurrentDirectory).FullName