Accumulate by bit [C #]-rounding (function)

Effect:

Description: enter a decimal number and the number of digits to be retained,

Event: click button

Code:

 1   Public   Static   Double Round ( Double D, Int  I)  2   {  3               If (D> = 0  )  4  {  5 D + = 5 * Math. Pow ( 10 ,-(I + 1 )); //  Evaluate the specified power of a specified number of times  6   }  7               Else  8   {  9 D + = 5 * Math. Pow ( 10 ,-(I + 1  ));  10   }  11               String STR = D. tostring ();  12               String [] STRs = Str. Split ( '  .  '  );  13               Int Idot = Str. indexof ( '  .  '  );  14               String Prestr = STRs [ 0  ];  15               String Poststr = STRs [ 1  ];  16               If (Poststr. length> I)  17  {  18 Poststr = Str. substring (idot + 1 , I ); //  Number of digits required for Truncation  19   }  20               If (Poststr. Length <= 2  )  21   {  22 Poststr = poststr +"  0  "  ;  23   }  24               String Strd = prestr + "  .  " + Poststr;  25 D = Double . Parse (strd ); //  Converts a string to a double-precision real number. 26               Return  D;  27   }  28   29           Private   Void Button#click ( Object  Sender, eventargs E)  30   {  31 Textbox3.text =Convert. tostring (math. Round (convert. todouble (textbox1.text. Trim (), convert. toint16 (textbox2.text. Trim ())));  32 }