Picture upload, including read image byte size and width, and Base64 conversion

Upload | convert <form id= "Picadd" method= "POST" runat= "server" enctype= "Multipart/form-data" >
<input type= "File" runat= "server" id= "pic" name= "pic" >
</form>
' ++++++++++++++++++++++ read the code below
Httppostedfile upfile=pic.postedfile;//Read Data
filelength=upfile.contentlength;//to get the length of the data
Judge whether or not to upload the picture
if (filelength==0)
{
Message.innerhtml= "Please select the file to upload";
message.style["Color"]= "red";
}
Else
{
Here to determine the size of the byte
Pic. Picclass length=new PIC. Picclass ();
BOOL Checkresult=length.checkbytes (filelength);
if (Checkresult==false)
{
Message.innerhtml= "Picture bytes cannot exceed 20K";
message.style["Color"]= "red";
}
Else
{
Judge the length and width of a picture
Byte[] Filebytearray=new byte[filelength];//image files are temporarily stored in a byte array
Stream streamobject=upfile.inputstream;//establish a data flow object
Streamobject.read (filebytearray,0,filelength);
Convert to BASE64 format
Pic. Picclass bytetobase=new PIC. Picclass ();
String Base64string=bytetobase.bytetobase64 (Filebytearray,0,filebytearray.length);
Create a Picture object
System.Drawing.Image Myimage=system.drawing.image.fromstream (Streamobject);
Start judging the size of the picture
Pic. Picclass checkimage=new PIC. Picclass ();
BOOL Checkimageresult=checkimage.checkimage (myimage.width, myimage.height);
if (Checkimageresult==false)
{
Message.innerhtml= "Please note that the picture width control within the 132*146";
message.style["Color"]= "red";
}
Else
{
Try
{
This omits the operation of the database
}
' ++++++++++++ below to determine byte size, picture size, and Base64 conversion
public bool Checkbytes (int filelength)
{
BOOL Result=true;
int length=20480;
if (filelength>length)
{
Result=false;
}
return result;
}
public bool Checkimage (int width,int Height)
{
BOOL Result=true;
int width=132,height=146;
if (width>width| | Height>height)
{
Result=false;
}
return result;
}
This is a binary to Base64 conversion.
public string ByteToBase64 (byte[] bytearry,int start,int Length)
{
string result;
Result=system.convert.tobase64string (bytearry,start,length);
return result;
}