Uploading images into picture library in sharepoint using c#

Here I explained a sample program to upload image files into picture library

spSite objSite = new SPSite(SPContext.Current.Web.Url);


try
{
byte[] imageData = null;
if (flUpload != null)
{
// This condition checks whether the user has uploaded a file or not
if ((flUpload.PostedFile != null) && (flUpload.PostedFile.ContentLength > 0))
{
Stream MyStream = flUpload.PostedFile.InputStream;
long iLength = MyStream.Length;
imageData = new byte[(int)MyStream.Length];
MyStream.Read(imageData, 0, (int)MyStream.Length);
MyStream.Close();
string filename = System.IO.Path.GetFileName(flUpload.PostedFile.FileName);
using (SPWeb myWeb = objSite.OpenWeb())
{
SPPictureLibrary pic = (SPPictureLibrary)myWeb.Lists["Images"];//Images is the picture library name
SPFileCollection filecol = ((SPPictureLibrary)myWeb.Lists["Images"]).RootFolder.Files;//getting all the files which is in pictire library
filecol.Add(filename , imageData);//uploading the files to picturte library
}
}
}
lblMessage.Text = "Uploaded successfully";
}
catch (Exception ex)
{
Response.Write(ex.Message);
}

How to read data from a txt file using c#

Before going to the code ,just know about stream reader

StreamReader:
streamreader is nothing but file pointer and here I used the stream reader to read the data from the text file(.txt) and displaying that it is in a label. System.IO.this is the name space required to deal with the files. To read a text file we need to create the instance of the object,StreamReader The instance will be the file pointer for us. Once we have a File Pointer, we need to invoke the method, OpenText method of the object, File. The method, OpenText takes a string as an argument. The string is nothing but the path of file that is going to get created.
Now, let us see an example.

String filename=Server.MapPath("new.txt");//here in the string we are storing the filepath StreamReader strrr;
strrr=File.OpenText(filename);//here streamreader pointing the files..means stream reader is nothing but a file pointer
lbltxt.Text=str;//here we are displaying the txt file data in the label.
strrr.Close();..
fstring str=strrr.ReadToEnd();