string[] strings = { "started", "starting", "ended", "ending" };
string output = "";
for ( int i = 0; i < strings.Length; i++ )
 if ( strings[ i ].StartsWith( "st" ) )
    output += "\"" + strings[ i ] + "\"" +  " starts with \"st\"\n";
 output += "\n";
label1.Text = output;
