Currency Conversion using webservice

Add web referance from given URL. It's Free

http://www.webservicex.net/CurrencyConvertor.asmx

Then write following code in Code behind :

using SampleCSharpApplication.net.webservicex.www;

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

Currency cur = new Currency();

Array arr;

arr = System.Enum.GetValues(cur.GetType());

ddlFrom.DataSource = arr;

ddlFrom.DataBind();

ddlTo.DataSource = arr;

ddlTo.DataBind();

}

}

protected void Button1_Click(object sender, EventArgs e)

{

CurrencyConvertor CC = new CurrencyConvertor();

Currency cur = new Currency();

txtResult.Text = CC.ConversionRate((Currency)System.Enum.Parse(cur.GetType(),
ddlFrom.Text), (Currency)System.Enum.Parse(cur.GetType(),
ddlTo.Text)).ToString();

}

<div>

<asp:Literal ID="ltrfrom" runat="server"

Text="Select Currency to convert :"></asp:Literal>

<asp:DropDownList ID="ddlFrom" runat="server"

Style="vertical-align: middle;">

</asp:DropDownList>

<br />

<asp:Literal ID="ltrTo" runat="server"

Text="Select Currency convert to :"></asp:Literal>

<asp:DropDownList ID="ddlTo" runat="server"

Style="vertical-align: middle;">

</asp:DropDownList>

<br />

</div>

<asp:Button ID="Button1" runat="server"

Text="Button" onclick="Button1_Click" />

<asp:TextBox ID="txtResult" runat="server" ></asp:TextBox>