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How do i convert this code snippet to c#
Public Sub ConfirmOnChange()
            'Register the script block
            If Not IsStartupScriptRegistered("CSP-ddl-onchange") Then
                RegisterStartupScript("CSP-ddl-onchange", _
                    "<script language=""JavaScript"">" & _
                    "var CSP_savedDDLID = " & _
                     "document.getElementById('" & _
                     ddl.ClientID & "').value;" & vbCrLf & _
                    "function resetDDLIndex() {" & vbCrLf & _
                    " document.getElementById('" & _
                     ddl_Status.ClientID & "').value = CSP_savedDDLID;" & _
                    vbCrLf & _
                    "}" & vbCrLf & _
                    "</script>")
            End If
            Dim msg As String = "'Do you want to change selection?';"
            ddl_Status.Attributes("onchange") = _
            "if (!confirm('" & msg.Replace("'", "'") & _
            "')) resetDDLIndex(); "
        End Sub

public void ConfirmOnChange()
{
    //Register the script block
    if(!IsStartupScriptRegistered("CSP-ddl-onchange"))
    {
        RegisterStartupScript("CSP-ddl-onchange",
            "<script language="JavaScript">" +
            "var CSP_savedDDLID = " +
                "document.getElementById('" +
                ddl.ClientID + "').value;" + "rn" +
            "function resetDDLIndex() {" + "rn" +
            " document.getElementById('" +
                ddl_Status.ClientID + "').value = CSP_savedDDLID;" +
            "rn" +
            "}" + "rn" +
            "</script>");
    }
    string msg = "'Do you want to change selection?';";
    ddl_Status.Attributes("onchange") = "if (!confirm('" & msg.Replace("'", "'") +
    "')) resetDDLIndex(); ";
}