Converting "2.800000000000000e+001" to ""28" in ASP.NET - asp.net

Question

Here is XML received by any web service,
<diy>
<tag1>14</tag1>
<tag2>2.000000000000000e+000</tag2>
<tag3>2.800000000000000e+001</tag3>
</diy>
This is code:
IEnumerable<XElement> xTag = from p in xmlDoc.Elements("document").Elements("xServ").Elements("b")
select p;
string tab = "<Table>";
foreach (var xTags in xTag)
{
tab += "<tr><td>" + Convert.ToString(xTags.Element("r").Element("Exp").Value) + "</td>";
tab += "<td>" + Convert.ToString(xTags.Element("r").Element("diy").Element("tag1").Value) + "</td>";
string s = Convert.ToString(xTags.Element("r").Element("diy").Element("tag2").Value);
string d = Math.Round(Convert.ToDouble(s)).ToString();
tab += "<td>" + d + "</td>";
tab += "<td>" + Convert.ToString(xTags.Element("r").Element("diy").Element("tag3").Value) + "</td>";
tab += "</tr>";
}
divTag.InnerHtml = tab + "</Table>";
When I used Math.Round(), it gives me "2,8E+16" !
how can I convert "2.000000000000000e+000" to "2" and "2.800000000000000e+001" to "28" in ASP.NET ?

Answer 1

Use Math library:
Math.Round(Convert.ToDouble("2.800000000000000e+001")).ToString();
that will return "28" .

Answer 2

How about this:
decimal.Parse("2.800000000000000e+001", System.Globalization.NumberStyles.Float).ToString("0.#");
Edit: added .NET format string to reduce to "28"

Answer 3

public static int function(float tag2)
{
do
{
if(tag2%10==0)
{
tag2=tag2/10.0;
}
else
{
int res = tag2;
return res;
}
}
while(true)
}

Answer 4

well I have to say that my solution is a bit funny! and beside that uses more memory than other ways.although other solutions use more cpu! life is trade off!
string MyNumber = "2.8000000e+1";
int DotIndex = MyNumber.IndexOf('.');
MyNumber = MyNumber.Remove(DotIndex, 1);
if(MyNumber[DotIndex] != '0')
DotIndex++;
MyNumber = MyNumber.Remove(DotIndex, MyNumber.Length - DotIndex);
DotIndex = Int32.Parse(MyNumber);
//MessageBox.Show(MyNumber); just to show the result!
It will return "2" for an input like "2.00000000e+1" AND "28" for "2.8000000e+1"!