Dot Net Code Snippets

We discuss about how to get the co-ordinates of the image , while you click on the image at runtime
so using javascript we will get the x and y co-ordinates of the image
so using this we can wirte the text on that image ie: where we clicked on that image.

Already i have posted the article how to write text on image check the GDI Labels

Javascript

<script language="JavaScript">
function point_it(event){

var txtX=document.getElementById('<%= XTextBox.ClientID %>');
var txtY=document.getElementById('<%= YTextBox.ClientID %>');
pos_x = event.offsetX?(event.offsetX):event.pageX-document.getElementById("pointer_div").offsetLeft;
alert(pos_x);


pos_y = event.offsetY?(event.offsetY):event.pageY-document.getElementById("pointer_div").offsetTop;
alert(pos_y);
txtX.value=pos_x;
txtY.value=pos_y;

}
</script&gt;

Here we have to discuss about how to create small rectangle with fill color and write text on image
for that you have to use some namespace

Imports System.IO
Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.Drawing.Text
Imports System.Drawing.Drawing2D

// Code behind file is

Protected Sub Button3_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button3.Click
Response.Clear() ' make sure Nothing has gone to the client
Dim imgOutput As New Bitmap(120, 30, PixelFormat.Format24bppRgb) ' create a New 24bit, 120x30 pixel image
Dim g As Graphics = Graphics.FromImage(imgOutput) ' create a New graphic object from the above bmp
' Application("intPageCount") += 1 ' really dumb page counter

g.Clear(Color.DarkGreen) ' blank the image
g.SmoothingMode = SmoothingMode.HighQuality ' antialias objects
' draw the number on the image canvas in verdana 10pt font bold
'g.DrawString("Count: " & Application("intPageCount"), New Font("verdana", 14, FontStyle.Bold), SystemBrushes.WindowText, New PointF(2, 2))
g.DrawString("A 2", New Font("verdana", 14, FontStyle.Bold), SystemBrushes.WindowText, New PointF(6, 6))
' draw a graduated fill across the image
g.FillRectangle(New LinearGradientBrush(New Point(0, 0), New Point(200, 200), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 255, 255)), 0, 0, 120, 120)
imgOutput.Save(Response.OutputStream, ImageFormat.Jpeg) ' output to the user
' tidy up
g.Dispose()
imgOutput.Dispose()
Response.End()
End Sub

All the best

Here we have to discuss about how to write a text on image

this is the code written in Button_Click Event

Dim i As System.Drawing.Image = System.Drawing.Image.FromFile(Server.MapPath("~/Availability/2_type_A.JPG"))
Dim b As Drawing.Bitmap
b = Sold(i, i.Width, i.Height, "Sold", 100)
b.Save(Server.MapPath("~/Updated/2_type_A.JPG"), System.Drawing.Imaging.ImageFormat.Jpeg)

 Private Function Sold(ByVal resim As System.Drawing.Image, ByVal genislik As Integer, ByVal yukseklik As Integer, ByVal yazilacak As String, ByVal font As Single) As Bitmap
Dim resmim As New Bitmap(resim, genislik, yukseklik)
Dim graf As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(resmim)
Dim firca As System.Drawing.SolidBrush = New SolidBrush(System.Drawing.Color.Red)
Dim fnt As System.Drawing.Font = New Font("Verdana", font)
Dim size As System.Drawing.SizeF = New SizeF(400, 400) ' this is the size of the font ie: width and height
Dim coor As System.Drawing.PointF = New PointF(XTextBox.Text, YTextBox.Text) ' this is X and Y Co-ordinates where you going to write the text on image
Dim kutu As System.Drawing.RectangleF = New RectangleF(coor, size)
Dim sf As New StringFormat()
sf.FormatFlags = StringFormatFlags.NoWrap
graf.DrawString(yazilacak, fnt, firca, kutu, sf)
Return resmim
End Function

Here is the code to set focus on some control , while we use the Master page

ScriptManager.RegisterStartupScript(Me, Me.GetType(), "Focus", String.Format("window.setTimeout('$get(""{0}"").focus()', 300);", ControlToFocus.ClientID), True)

or Refer this article

http://www.dotnetcurry.com/ShowArticle.aspx?ID=275

Showing messagebox like yes , no in vb.net and proceed if yes else exit ..

       Dim button As DialogResult

      button = MessageBox.Show _
      ("Are you sure you want to exit this application?", _
      "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1)

      If button = Windows.Forms.DialogResult.Yes Then
          Me.Close()
      Else
          'Do Nothing
      End If

Here the number of way to show the date ie: extract from the SQL query

select convert(varchar,getdate(),101)
OutPut:- 06/18/2008

select convert(varchar,getdate(),102)
OutPut:- 2008.06.18

select convert(varchar,getdate(),103)
OutPut:- 18/06/2008

select convert(varchar,getdate(),104)
OutPut:- 18.06.2008

select convert(varchar,getdate(),105)
OutPut:- 18-06-2008

select convert(varchar,getdate(),106)
OutPut:- 18 Jun 2008

select convert(varchar,getdate(),107)
OutPut:- Jun 18, 2008

select convert(varchar,getdate(),108)
OutPut:- 10:53:20

select convert(varchar,getdate(),109)
OutPut:- Jun 18 2008 10:53:30:507AM

select convert(varchar,getdate(),110)
OutPut:- 06-18-2008

select convert(varchar,getdate(),111)
OutPut:- 2008/06/18

select convert(varchar,getdate(),112)
OutPut:- 20080618

select convert(varchar,getdate(),113)
OutPut:- 18 Jun 2008 10:54:01:253

select convert(varchar,getdate(),114)
OutPut:- 10:54:08:473

select convert(varchar,getdate(),120))
OutPut:- 2008-06-18 10:54:15 

Hi, if you got error like this..Could not load file or Assembly for While you adding AjaxToolkit.dll

You have update your ajaxtoolkit from Codeplex.com

Here the link

http://www.codeplex.com/AjaxControlToolkit/Release/ProjectReleases.aspx?ReleaseId=8513

To upload large files in asp.net you have to increase the MaxrequestLength and Executiontimeout of the httpruntime settings of your web.config file.By Default it will upload 4MB

suppose if i want to upload upto 8 MB you have to include this tag in you web.config file , don't change anything in your machine.config files.

httpruntime  maxRequestLength="1048576" executionTimeout="450"

 

To validate the fileupload control use Custom Validator and call this function on ClientValidateFunction property of Custom validator.

You can pass the file extension , Watever you want to allow..

function ValidateSFrontImageUpload(Source, args)
{
var fuData = document.getElementById('<%= FrontSImage_FileUpload.ClientID %>');
var FileUploadPath = fuData.value;

if(FileUploadPath =='')
{
// There is no file selected
args.IsValid = false;
}
else
{
var Extension = FileUploadPath.substring(FileUploadPath.lastIndexOf('.') + 1).toLowerCase();

if (Extension == "jpg" || Extension == "jpeg" || Extension == "png" || Extension == "gif")
{
args.IsValid = true; // Valid file type
}
else
{
args.IsValid = false; // Not valid file type
}
}
}