Beginning .Net , C# Tips : Encodings in StreamReader

The StreamReader by default attempts to determine the encoding format of the file. If one of the supported encodings such as UTF-8 or UNICODE is detected, it is used. If the encoding is not recognized,the default encoding of UTF-8 is used. Depending on the constructor you call, you can change the default encoding used and optionally turn off encoding detection.

Below syntax shows how you can control the encoding that the StreamReader uses.
Syntax :

StreamReader reader = new StreamReader(MapPath(TextFile.txt"),System.Text.Encoding.Unicode);

The default encoding for the StreamWriter is also UTF-8, and you can override it in the same manner as with the StreamReader class.

Beginning .Net , C# Tips : Reading and writing a text file with a StreamReader in C# Programming

StreamReader and StreamWriter classes to write a string to a text file and then read the contents of that text file.

Here are Exmaple for Write and Read File.

C# Example :

         /////Write to a file
        System.IO.StreamWriter streamwriter = new System.IO.StreamWriter(System.IO.File.Open
(MapPath("TextFile.txt"),System.IO.FileMode.OpenOrCreate));
        streamwriter.Write("This is a sample string");
        streamwriter.Close();

        //////Read from a file
        System.IO.StreamReader reader =new System.IO.StreamReader(System.IO.File.Open(MapPath
("TextFile.txt"),System.IO.FileMode.Open));
        string tmp = reader.ReadToEnd();
        reader.Close();

When you create a StreamReader, you must pass an existing stream instance as a constructor
parameter. The reader uses this stream as its underlying data source.
In this sample, you use the File class’s Open method to open a writable FileStream for your StreamWriter.

Also notice that you no longer have to deal with byte arrays. The StreamReader takes care of converting the data to a type that’s more user-friendly than a byte array. In this example, you are using the ReadToEnd method to read the entire stream and convert it to a string.The StreamReader provides a number of different methods for reading data that you can use depending on exactly how you want to read the data, from reading a single character using the Read method, to reading the entire file using the ReadToEnd method.

VB.net Example :

    /////Write to a file
    Dim streamwriter As New System.IO.StreamWriter(System.IO.File.Open(MapPath
                     ("TextFile.txt"),System.IO.FileMode.Open))
    streamwriter.Write("This is a string")
    streamwriter.Close()

    //////Read from a file
    Dim reader As New System.IO.StreamReader(System.IO.File.Open(MapPath
                   ("TextFile.txt"),System.IO.FileMode.Open))
    Dim tmp As String = reader.ReadToEnd()
    reader.Close()