i cannot format my values as i want, i need to know how to add 0 on right of the number, how to do it?

hello,
i'm receiving values,  as follow:
2.23
1.1
0.34
2.2

what i'd like to have then is  two values after the coma,  as follow
2.23
1.10
0.34
2.20

i've been trying to do it with the following method.
    double _tempVal = double.Parse(row["weight"].ToString());
   //String.Format("{0:0.00}", _tempVal);   <-- did not doit
    String.Format("{0:#,##0.00}", _tempVal); <-- ko also

i use then the value to create an html table
 _builder.Append("<td width=200>");
      _builder.Append(_tempVal);
 _builder.Append("</td>");

the problme is that i never succeed with two decimals(two values on right of the coma)

thank you in advance for solution with explanation,
   ......
toshi_Asked:
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RamuncikasConnect With a Mentor Commented:
By default Excel trims down trailing zeros from numbers after comma. If you open excel, write some number like 12.3400 you'll see that trailing zeros are gone after you hit ENTER key. That is a problem not relating to ASP.NET.

Try changing downloaded file's extension to .txt and open it in notepad. You'll see HTML code in there. If numbers in this HTML DO have trailing zeros then it is problem with Excel. But if you will see numbers WITHOUT trailing zeros then there is a problem with output (code in your page/handler)

R
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RamuncikasCommented:
double _tempVal = double.Parse(row["weight"].ToString());
...
 _builder.Append(_tempVal.ToString("#,##0.00"));
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Anurag ThakurConnect With a Mentor Technical ManagerCommented:
if you want to convert 1.1 to 1.10 then use
(1.1).ToString("0.00");
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toshi_Author Commented:
thank Ramuncikas and ragi0017 for your reply,

when i generate my html, i use it then to generate an xls file.

....
  Response.Clear();
            Response.Buffer = true;
            Response.ContentType = "application/vnd.ms-excel";
            //Response.ContentEncoding = System.Text.Encoding.GetEncoding("iso-8859-2");
            Response.ContentEncoding = System.Text.Encoding.UTF8;
            Response.Charset = "";
            this.EnableViewState = false;
            Response.AddHeader("Content-Disposition", "filename=ContainerDrain_.xls");
            Response.Write(PrepareCompleteOutputForExcel().ToString());                              <--- my html
            Response.End();
.....

as your 2 comment are not changing anything, they are not changing 1.1 to 1.10,
i 'm wondering if the issue is from my excel export,

how to check ?
what to do ?
any idea??

As the probleme seem more complicated i'll give more  points for the question , up to 500.-
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