public int findStartOffset(StringBuilder buffer, int start) {if( start > buffer.length() || start < 1 ) return start;bi.setText(buffer.substring(0, start));bi.last();return bi.previous();}

public int findStartOffset ( StringBuilder buffer , int start ) { if ( start > buffer . length ( ) || start < 1 ) return start ; bi . setText ( buffer . substring ( 0 , start ) ) ; bi . last ( ) ; return bi . previous ( ) ; }
public virtual int FindStartOffset(StringBuilder buffer, int start){if (start > buffer.Length || start < 1) return start;bi.SetText(buffer.ToString(0, start - 0));bi.Last();return bi.Previous();}
