Please note: If you find any post DOES NOT contain required amount of explanation, please do comment them with a request for more information. I will update as soon as I can attend to it. Also you can contact me with a link to the post.

Saturday, December 17, 2011

How to validate a number between 0-24 with Java Scripts 

<%@ Page Language="C#" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <script language="javascript" type="text/javascript">
        function checkIt(obj, evt) {
            evt = (evt) ? evt : window.event
            var charCode = (evt.which) ? evt.which : evt.keyCode
            if ((charCode < 45 || charCode > 57) && charCode != 8 && charCode != 37 && charCode != 39) {
                alert("This field accepts numbers only")
                return false
            }
            var t = (charCode / 1) - 48;
            var v = obj.value + t;
            var value = v / 1;
            if(value > 24){ 
                alert("Number should be less than 24");
                return false;
            }
            return true
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox runat="server" ID="txtNumber" onKeyPress='javascript:return checkIt(this, event)' />
    </div>
    </form>
</body>
</html>
Posted by Charith Shyam Gunasekara at 5:06 PM
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Wednesday, December 14, 2011

How to retain the password in a postback 

<%@ Page Language="C#" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Test Page</title>
    <script runat="server">
        public string Password
        {
            get { return ViewState["Password"] as string; }
            set { this.ViewState["Password"] = value; }
        }
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            if (this.IsPostBack)
            {
                if (!string.IsNullOrEmpty(this.txtPassword.Text))
                    this.Password = this.txtPassword.Text;
                this.txtPassword.Attributes.Add("value", this.Password ?? string.Empty);
            }
        }
    </script>
</head>
<body>
    <form  id="aspNetForm" runat="server">
        UserName: <asp:TextBox runat="server" ID="txtName" />
        Password: <asp:TextBox runat="server" ID="txtPassword" TextMode="Password" />
        <hr />
        <asp:Button runat="server" ID="btnSave" Text="Save" />
    </form>
</body>
</html>
Posted by Charith Shyam Gunasekara at 1:11 PM
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Tuesday, December 13, 2011

Html Header Tag Sizes

  • H1 - 24pt / 32px
  • H2 - 18pt / 24px
  • H3 - 14pt / 18px
  • H4 - 12pt / 15px
  • H5 - 10pt / 13px
  • H6 - 8pt   / 11px
Above are the default font sizes in points and their approximate sizes in pixels
Posted by Charith Shyam Gunasekara at 8:38 AM
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Friday, August 19, 2011

How to upload a external image link url and save on the disk

 We can get the use of HttpWebRequest and HttpWebResponse to send the request and get the response. Then response.GetResponseStream() will give us a stream of the image where we can use that stream to create a Image object like Image image = Image.FromStream(stream)

Markup:
<%@ Page Language="C#" CodeBehind="Test.aspx.cs" Inherits="ActiveTest.Test" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox runat="server" ID="txtUpload" 
            Text="http://www.web-sphere.co.uk/web/websphere/blog/bloggerheader.jpg" />
        <asp:Button runat="server" ID="btnUpload" OnClick="Upload" Text="Upload" />
    </div> 
    </form>
</body>
</html>
Code: 
namespace ActiveTest
{
    public partial class Test : Page
    {
        protected void Upload(object sender, EventArgs e)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(this.txtUpload.Text);
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            Stream stream = response.GetResponseStream();         
            ///
            /// use response content type to findout the image type, 
            /// here I just use jpg to simplify the story.
            /// 
            System.Drawing.Image image = System.Drawing.Image.FromStream(stream);
            image.Save(this.Server.MapPath(string.Format("~/Uploads/{0}.jpg",Guid.NewGuid())));
        }
    }
}
Posted by Charith Shyam Gunasekara at 5:09 AM
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Tuesday, November 16, 2010

How to output web page as MS word document 

public partial class Test : Page
{
    protected override void Render(HtmlTextWriter writer)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.ContentType = "application/msword";
        StringBuilder sb = new StringBuilder();
        StringWriter stringWriter = new StringWriter(sb);
        HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);
        base.Render(htmlTextWriter);
        Response.Write(sb.ToString());
        Response.End();            
    }
}
Posted by Charith Shyam Gunasekara at 11:17 AM
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