ASP.NET

StringBuilder sb = new StringBuilder();
            StringWriter sw = new StringWriter(sb);
            HtmlTextWriter textWriter = new HtmlTextWriter(sw);
            grid1.RenderControl(textWriter);
            string gridHTML= sb.ToString();

For Each Line As String In TextBox1.Lines
    If Not IsValidEmail(Line) Then
        ...
    End If
Next

<script type="text/javascript">    
    function ClientSidePrint(idDiv)     
    {           
        var w = 600;          
        var h = 400;          
        var l = (window.screen.availWidth - w)/2;          
        var t = (window.screen.availHeight - h)/2;                       var sOption="toolbar=no,location=no,directories=no,menubar=no,
scrollbars=yes,width=" + w + ",height=" + h + ",left=" + l + ",top="+t;        
// Get the HTML content of the div      
 var sDivText = window.document.getElementById(idDiv).innerHTML;      
// Open a new window      
var objWindow = window.open("", "Print", sOption);    
// Write the div element to the window    
objWindow.document.write(sDivText);    
objWindow.document.close();      
// Print the window                      
objWindow.print();      
// Close the   window    
objWindow.close();                     } 
</script>