C#

<br />
int iDec = int.Parse(dec)<br />
double dAmount = double.Parse(amount)<br />
dAmount *= 10;     // for some reason you appear to be adding a zero in your question?<br />
dAmount /= Math.Pow(10,iDec);<br />
Amount = dAmount.ToString("f" + iDec);<br />
<code>

amount.Substring(0,amount.Length-(dec[0]-'0'))+"."+amount.SubString(amount.Length-(dec[0]-'0')

{
   bc	= new BoundColumn();
   .
   .
   .
   if( c.ItemType == "Time" )
   {
     bc.DataFormatString = "{0:t}";
     bc.ItemStyle.Wrap = false;
   }
   if( c.ItemType == "Date" )
   {
      bc.DataFormatString = "{0:d}";
      bc.ItemStyle.Wrap = false;
   }
   DataGrid1.Columns.Add( bc );
}

Google talk: binarybandit