.NET (Core and Framework)

int mupper = theArray.GetUpperBound(0);
int nupper = theArray.GetUpperBound(1);
 
ws.Write(mupper);
ws.Write(nupper);

for (int i = 0; i < mupper; i++)
{
   for (int j = 0; j < nupper; i++)
      wr.Write(theArray[i, j]);
}

//  rdr is a BinaryReader
int mupper = rdr.ReadInt32();
int nupper = rdr.ReadInt32();
byte[,] theArray = new byte[mupper, nupper];
 
for (int i = 0; i < mupper; i++)
{
   for (int j = 0; j < nupper; i++)
      theArray[i, j] = rdr.ReadByte();
}

byte[][]  theArray = new byte[m][];
 
for (int i = 0; i < theArray.Length; i++)
   theArray[i] = new byte[n];

//  wr is our BinaryWriter
wr.Write(theArray.Length);  //  m
wr.Write(theArray[0].Length);  //  n
  
for (int i = 0; i < theArray.Length; i++)
   wr.Write(theArray[i]);

//  rdr is a BinaryReader
int m = rdr.ReadInt32();
int n = rdr.ReadInt32();
byte[][] theArray = new byte[m][];
 
for (int i = 0; i < theArray.Length; i++)
   theArray[i] = rdr.ReadBytes(n);

<br />
for ( int i = myArray.GetLowerBound(0); i <= myArray.GetUpperBound(0); i++ )<br />
    for ( int j = myArray.GetLowerBound(1); j <= myArray.GetUpperBound(1); j++ )<br />
         myFileStream.WriteByte(byte.Parse(myArray.GetValue( i, j ).ToString()) );<br />

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"When the only tool you have is a hammer, a sore thumb you will have."

XmlDocument doc = new XmlDocument();<br />
XmlProcessingInstruction pi = doc.CreateProcessingInstruction(...);<br />
doc.AppendChild(pi);

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"When the only tool you have is a hammer, a sore thumb you will have."