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DB_Conn_String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\Inetpub\\wwwroot\\ruiwen.mdb";

ImgConn =new OleDbConnection( DB_Conn_String );

ImgDataAdapter =new OleDbDataAdapter();

FileStream fs;// Writes the BLOB to a file (*.bmp).

BinaryWriter bw;// Streams the BLOB to the FileStream object.

int bufferSize = 100;// Size of the BLOB buffer.

byte[] outbyte =newbyte[bufferSize];// The BLOB byte[] buffer to be filled by GetBytes.

long retval;// The bytes returned from GetBytes.

long startIndex = 0;// The starting position in the BLOB output.

int img_id = 0;// The image #.

// Open the connection and read data into the DataReader.

// Create the SelectCommand.

cmd =new OleDbCommand( "SELECT * FROM rw_obj", ImgConn );

ImgConn.Open();

OleDbDataReader myReader = cmd.ExecuteReader( CommandBehavior.SequentialAccess );

while( myReader.Read() )

{

img_id++;

// Create a file to hold the output.

fs =new FileStream( "c:\\rw" + img_id + ".bmp", FileMode.OpenOrCreate, FileAccess.Write );

bw =new BinaryWriter( fs );

// Reset the starting byte for the new BLOB.

// Read the bytes into outbyte[] and retain the number of bytes returned.

// Continue reading and writing while there are bytes beyond the size of the buffer.

while (retval == bufferSize)

{

bw.Write(outbyte);

bw.Flush();

// Reposition the start index to the end of the last buffer and fill the buffer.

// Write the remaining buffer.

bw.Write( outbyte, 0, (int )retval - 1 );

bw.Flush();

// Close the output file.

// Close the reader and the connection.