Encoding

[C# Programming]

I want to understand this code pls public GFile(string Filename)
{
string[] fileCtx = File.ReadAllLines(Filename, Encoding.Default); GLine gline;
string[] tmpCtx;
foreach (string line in fileCtx)
{
if (line.Contains(m_leftBracket) && line.Contains(m_rightBracket) && line != m_CRCHeader)
m_Header = line;
else if (line != m_CRCHeader)
{
tmpCtx = line.Split(new string[] { m_Equals }, StringSplitOptions.RemoveEmptyEntries);
gline = new GLine(tmpCtx[0], tmpCtx[1]);
if (ContainsKey(gline.Code))
this[gline.Code].CRCGiven = short.Parse(tmpCtx[1]);
else
Add(gline.Code, gline);
}
}
}