c# - How convert string array into one string

If you use this code on string array:

string[] args = Environment.GetCommandLineArgs();      
Console.Write( args.ToString() );

you will get:

System.String[]

But better way in this case is to use string.Join() function (where you can set used delimiter):

string[] args = Environment.GetCommandLineArgs();      
Console.Write( string.Join( ",", args ) );

Then:

C:\app.dll,layoutdir=C:/app/bin

C# - How to convert first character of string to upper letter

The problem is little complicated, because access to string chars (through indexer) is only read-only.
One way is this:

row.Constellation = arr[2].Trim().ToLower();
char[] ch = row.Constellation.ToCharArray();
ch[0] = char.ToUpper( row.Constellation[0] );
row.Constellation = new string( ch );