This code allows us to get the reference of a method using Reflection and assign it to an event.
Delegate d; // This code gets the reference of the OnSubmit method from the control // object. The OnSubmit method must be implementing the Click // Handler d = Delegate.CreateDelegate(btnSubmit.GetType() .GetEvent("Click").EventHandlerType, control, "OnSubmit"); // This code assigns the Click handler to the Click event of the button btnSubmit.Click += (EventHandler) d;
Usefult tools and libraries for development
Tigris.Org – Home of the famous open source subversion.
Fiddler – Web debugging tools.
IIS Tools – Tools for debugging / monitoring IIS.
SysInternals – Tools for monitoring process
FileHelpers – Strong type your flat file (fixed or delimited) simply describing a class that maps to each record and later read/write your file as an strong typed .NET array
Very nice MSDN article on guide to improving .NET Application Performance.
http://msdn.microsoft.com/en-us/library/ms998530.aspx
happy reading
Most of us find it difficult to implement a similar FindControl functionality from GridView in UltraWebGrid using the TemplatedColum. Here is a way to do it.
/// <summary> /// Initalize grid row /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void _Grid_InitializeRow(object sender, Infragistics.WebUI.UltraWebGrid.RowEventArgs e) { UltraWebGrid grid = sender as UltraWebGrid; if(grid == null) return; TemplatedColumn col = (TemplatedColumn) grid.Columns[0]; CellItem item = (CellItem) col.CellItems[e.Row.Index]; RadioButton optSelect = item.FindControl("optSelect") as RadioButton; if (optSelect != null) { optSelect.Attributes["onclick"] = string.Format("alert('Row# : {0}')", e.Row.Index); } }
Most of us will find that placing a RadioButton in a grid will not work as it used to be, all the options may be selected and you cannot implement grouping.
I have found a very nice article in the code project where the author developed / extended the radio button control to function like this. I cannot find the article again however I will just paste the code here just for reference.
/// <summary> /// GroupRadioButton control is a standard radio-button with the extended /// abilities to be used in groups. /// </summary> /// <remarks> /// Standard <see cref="System.Web.UI.WebControls.RadioButton"/> controls /// cannot be grouped when are placed at the different rows of the DataGrid, /// DataList, Repeater, etc. controls. /// /// The "name" attribute of the radio button HTML control that is rendered /// at the web form after RadioButton control has been executed is depend /// on the UniqueID of the RadioButton. So for the different rows of the /// DataGrid/DataList/Repeater these attributes are different and radio /// buttons do not belong to the same group. /// </remarks> [ToolboxData("<{0}:MyGroupRadioButton runat=server></{0}:MyGroupRadioButton >")] public class MyGroupRadioButton : RadioButton, IPostBackDataHandler { /// <summary> /// /// </summary> public MyGroupRadioButton () : base() { } #region Properties private string Value { get { string val = Attributes["value"]; if (val == null) val = UniqueID; else val = UniqueID + "_" + val; return val; } } #endregion #region Rendering protected override void Render(HtmlTextWriter output) { RenderInputTag(output); } private void RenderInputTag(HtmlTextWriter htw) { htw.AddAttribute(HtmlTextWriterAttribute.Id, ClientID); htw.AddAttribute(HtmlTextWriterAttribute.Type, "radio"); htw.AddAttribute(HtmlTextWriterAttribute.Name, GroupName); htw.AddAttribute(HtmlTextWriterAttribute.Value, Value); if (Checked) htw.AddAttribute(HtmlTextWriterAttribute.Checked, "checked"); if (!Enabled) htw.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled"); string onClick = Attributes["onclick"]; if (AutoPostBack) { if (onClick != null) onClick = String.Empty; //onClick += Page.GetPostBackClientEvent(this, String.Empty); onClick += this.Page.ClientScript.GetPostBackEventReference( this, string.Empty ); htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick); htw.AddAttribute("language", "javascript"); } else { if (onClick != null) htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick); } if (AccessKey.Length > 0) htw.AddAttribute(HtmlTextWriterAttribute.Accesskey, AccessKey); if (TabIndex != 0) htw.AddAttribute(HtmlTextWriterAttribute.Tabindex, TabIndex.ToString(NumberFormatInfo.InvariantInfo)); htw.RenderBeginTag(HtmlTextWriterTag.Input); htw.RenderEndTag(); } #endregion #region IPostBackDataHandler Members void IPostBackDataHandler.RaisePostDataChangedEvent() { OnCheckedChanged(EventArgs.Empty); } bool IPostBackDataHandler.LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection) { bool result = false; string value = postCollection[GroupName]; if ((value != null) && (value == Value)) { if (!Checked) { Checked = true; result = true; } } else { if (Checked) Checked = false; } return result; } #endregion }
Mostly happens in an ASP.NET developers life is to develop paging in the Grid. It has been a popular way to implement paging in the database server itself. But how if you cannot change the database object, so you have no choice but to implement paging in your web page alone.
Currently the ASP.NET GridView is already equiped with this functionality however this feature if for the Grid control alone. We have a PagedDataSource which you can implement this easily. Please see code below.
private PagedDataSource _PagedDataSource; /// <summary> /// Gets the datasource bound to the grid /// </summary> /// <returns></returns> protected PagedDataSource GetGridDataSource(int page) { if (_PagedDataSource == null) { _PagedDataSource = new PagedDataSource(); _PagedDataSource.AllowPaging = true; _PagedDataSource.PageSize = 20; _PagedDataSource.DataSource = GetCustomerOrders(); } _PagedDataSource.CurrentPageIndex = page; return _PagedDataSource; } /// <summary> /// Page Load /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void Page_Load(object sender, EventArgs e) { grdOrders.DataSource = GetGridDataSource(1); grdOrders.DataBind(); }
Useful Command Tools
1. NetStat – Displays protocol statistics and current TCP/IP network connections.
NETSTAT [-a] [-b] [-e] [-n] [-o] [-p proto] [-r] [-s] [-v] [interval] -a Displays all connections and listening ports. -b Displays the executable involved in creating each connection or listening port. In some cases well-known executables host multiple independent components, and in these cases the sequence of components involved in creating the connection or listening port is displayed. In this case the executable name is in [] at the bottom, on top is the component it called, and so forth until TCP/IP was reached. Note that this option can be time-consuming and will fail unless you have sufficient permissions. -e Displays Ethernet statistics. This may be combined with the -s option. -n Displays addresses and port numbers in numerical form. -o Displays the owning process ID associated with each connection. -p proto Shows connections for the protocol specified by proto; proto may be any of: TCP, UDP, TCPv6, or UDPv6. If used with the -s option to display per-protocol statistics, proto may be any of: IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, or UDPv6. -r Displays the routing table. -s Displays per-protocol statistics. By default, statistics are shown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6; the -p option may be used to specify a subset of the default. -v When used in conjunction with -b, will display sequence of components involved in creating the connection or listening port for all executables. interval Redisplays selected statistics, pausing interval seconds between each display. Press CTRL+C to stop redisplaying statistics. If omitted, netstat will print the current configuration information once.
2. NBTStat – Displays protocol statistics and current TCP/IP connections using NBT (NetBIOS over TCP/IP).
NBTSTAT [ [-a RemoteName] [-A IP address] [-c] [-n]
[-r] [-R] [-RR] [-s] [-S] [interval] ]
-a (adapter status) Lists the remote machine's name table given its name
-A (Adapter status) Lists the remote machine's name table given its
IP address.
-c (cache) Lists NBT's cache of remote [machine] names and their IP addresses
-n (names) Lists local NetBIOS names.
-r (resolved) Lists names resolved by broadcast and via WINS
-R (Reload) Purges and reloads the remote cache name table
-S (Sessions) Lists sessions table with the destination IP addresses
-s (sessions) Lists sessions table converting destination IP
addresses to computer NETBIOS names.
-RR (ReleaseRefresh) Sends Name Release packets to WINS and then, starts Refresh
RemoteName Remote host machine name.
IP address Dotted decimal representation of the IP address.
interval Redisplays selected statistics, pausing interval seconds
between each display. Press Ctrl+C to stop redisplaying
statistics.
3. TaskList – This command line tool displays a list of application(s) and associated task(s)/process(es) currently running on either a local or remote system.
TASKLIST [/S system [/U username [/P [password]]]]
[/M [module] | /SVC | /V] [/FI filter] [/FO format] [/NH]
Parameter List:
/S system Specifies the remote system to connect to.
/U [domain\]user Specifies the user context under which
the command should execute.
/P [password] Specifies the password for the given
user context. Prompts for input if omitted.
/M [module] Lists all tasks that have DLL modules loaded
in them that match the given pattern name.
If the module name is not specified,
displays all modules loaded by each task.
/SVC Displays services in each process.
/V Specifies that the verbose information
is to be displayed.
/FI filter Displays a set of tasks that match a
given criteria specified by the filter.
/FO format Specifies the output format.
Valid values: "TABLE", "LIST", "CSV".
/NH Specifies that the "Column Header" should
not be displayed in the output.
Valid only for "TABLE" and "CSV" formats.
/? Displays this help/usage.
Filters:
Filter Name Valid Operators Valid Value(s)
----------- --------------- --------------
STATUS eq, ne RUNNING | NOT RESPONDING
IMAGENAME eq, ne Image name
PID eq, ne, gt, lt, ge, le PID value
SESSION eq, ne, gt, lt, ge, le Session number
SESSIONNAME eq, ne Session name
CPUTIME eq, ne, gt, lt, ge, le CPU time in the format
of hh:mm:ss.
hh - hours,
mm - minutes, ss - seconds
MEMUSAGE eq, ne, gt, lt, ge, le Memory usage in KB
USERNAME eq, ne User name in [domain\]user
format
SERVICES eq, ne Service name
WINDOWTITLE eq, ne Window title
MODULES eq, ne DLL name
Examples:
TASKLIST
TASKLIST /M
TASKLIST /V
TASKLIST /SVC
TASKLIST /M wbem*
TASKLIST /S system /FO LIST
TASKLIST /S system /U domain\username /FO CSV /NH
TASKLIST /S system /U username /P password /FO TABLE /NH
TASKLIST /FI "USERNAME ne NT AUTHORITY\SYSTEM" /FI "STATUS eq running"
4. TaskKill – This command line tool can be used to end one or more processes. Processes can be killed by the process id or image name.
TASKKILL [/S system [/U username [/P [password]]]]
{ [/FI filter] [/PID processid | /IM imagename] } [/F] [/T]
Description:
This command line tool can be used to end one or more processes.
Processes can be killed by the process id or image name.
Parameter List:
/S system Specifies the remote system to connect to.
/U [domain\]user Specifies the user context under which
the command should execute.
/P [password] Specifies the password for the given
user context. Prompts for input if omitted.
/F Specifies to forcefully terminate
process(es).
/FI filter Displays a set of tasks that match a
given criteria specified by the filter.
/PID process id Specifies the PID of the process that
has to be terminated.
/IM image name Specifies the image name of the process
that has to be terminated. Wildcard '*'
can be used to specify all image names.
/T Tree kill: terminates the specified process
and any child processes which were started by it.
/? Displays this help/usage.
Filters:
Filter Name Valid Operators Valid Value(s)
----------- --------------- --------------
STATUS eq, ne RUNNING | NOT RESPONDING
IMAGENAME eq, ne Image name
PID eq, ne, gt, lt, ge, le PID value
SESSION eq, ne, gt, lt, ge, le Session number.
CPUTIME eq, ne, gt, lt, ge, le CPU time in the format
of hh:mm:ss.
hh - hours,
mm - minutes, ss - seconds
MEMUSAGE eq, ne, gt, lt, ge, le Memory usage in KB
USERNAME eq, ne User name in [domain\]user
format
MODULES eq, ne DLL name
SERVICES eq, ne Service name
WINDOWTITLE eq, ne Window title
NOTE: Wildcard '*' for the /IM switch is accepted only with filters.
NOTE: Termination of remote processes will always be done forcefully
irrespective of whether /F option is specified or not.
Examples:
TASKKILL /S system /F /IM notepad.exe /T
TASKKILL /PID 1230 /PID 1241 /PID 1253 /T
TASKKILL /F /IM notepad.exe /IM mspaint.exe
TASKKILL /F /FI "PID ge 1000" /FI "WINDOWTITLE ne untitle*"
TASKKILL /F /FI "USERNAME eq NT AUTHORITY\SYSTEM" /IM notepad.exe
TASKKILL /S system /U domain\username /FI "USERNAME ne NT*" /IM *
TASKKILL /S system /U username /P password /FI "IMAGENAME eq note*"
I just listed below some interesting links I’ve found from the MSDN Magazine site. I decided to post it my blog so I wont forget about this links and I can visit them everytime I want. It’s already 12.30am here in Singapore so I don’t have to read them now, I hope I will have time tomorrow.
Updatepanel Tips and Tricks
– http://msdn.microsoft.com/en-us/magazine/cc163413.aspx
Canceling Server Task with ASP.NET AJAX
– http://msdn.microsoft.com/en-us/magazine/cc163380.aspx
AJAX Application Architecture
– http://msdn.microsoft.com/en-us/magazine/cc163363.aspx
– http://msdn.microsoft.com/en-us/magazine/cc163347.aspx
Scriptmanagers
– http://msdn.microsoft.com/en-us/magazine/cc163354.aspx
Inside MS AJAX Library
– http://msdn.microsoft.com/en-us/magazine/cc163300.aspx
Scaling Strategies in ASP.NET
– http://msdn.microsoft.com/en-us/magazine/cc500561.aspx
AJAX Design Patterns
– http://blogs.msdn.com/msdnmagazine/archive/2008/06/06/8578509.aspx
Most of the time when developing a web application we will encounter scenarios wherein we need to call a page function or a web service function from client script (e.g. javascript). Thought ASP.NET AJAX has created a PageMethods to do this task, however studying the html that it generates we will find that it creates complex markup to our page which may add to the size of html being rendered and transmitted into the network. Here is an alternative example to do this.
Javascript:
<form id="_default" runat="server"> <asp:ScriptManager ID="_ScriptManager" runat="server"></asp:ScriptManager> <script type="text/javascript"> //<!-- function ShowServerDateWS() { Sys.Net.WebServiceProxy.invoke('CommonUtil.asmx', 'GetServerDate', true, {},function (result, args) { alert(result); },function (error) { alert('sorry error happens...'); }, '',0 ); } function ShowServerDateWP() { Sys.Net.WebServiceProxy.invoke('CommonFunctions.aspx', 'GetServerDate', true, {},function (result, args) { alert(result); },function (error) { alert('sorry error happens...'); }, '',0 ); } //--> </script> <input type="button" id="btnShowServerDateWs" value="Show Server Date from Web Service" onclick="javascript:ShowServerDateWS()" /><br /> <input type="button" id="btnShowServerDateWp" value="Show Server Date from Web Page" onclick="javascript:ShowServerDateWP()" /><br /> </form>
Web Page:
[System.Web.Services.WebService()] public partial class CommonFunctions : System.Web.UI.Page { [System.Web.Services.WebMethod()] [System.Web.Script.Services.ScriptMethod(UseHttpGet = true)] public static string GetServerDate() { return DateTime.Now.ToString("dd-MMM-yyyy"); } }
Web Service:
[System.Web.Services.WebService()] [System.Web.Script.Services.ScriptService] public class CommonUtil : System.Web.Services.WebService { [System.Web.Services.WebMethod()] [System.Web.Script.Services.ScriptMethod(UseHttpGet = true)] public string GetServerDate() { return DateTime.Now.ToString("dd-MMM-yyyy"); } }
Cheers!
Declare InitializeTree and DemandLoad event handlers in the ClientSideEvents of the UltraWebTree.
<ClientSideEvents InitializeTree="func_initializeTree" DemandLoad="func_demandLoad" />
The DemandLoad event handler will respond when the user click on a node and process an ajax postback to retrieve thechild nodes. In this handler you can display any progress indicator message.
The InitializeTree event handler will act like the callback, this is assumed because the UltraWebTree does not have any AfterDemandLoad event. In this handler you can hide the progress indicator message.
var _currentNodeId = ''; var _currentNodeText = ''; function func_initializeTree(treeId) { var tree; tree = igtree_getTreeById(treeId); if(_currentNodeId.length > 0 && _currentNodeText.length > 0) { var node = igtree_getNodeById(_currentNodeId); node.setText(_currentNodeText); } _currentNodeId = ''; _currentNodeText = ''; } function func_demandLoad(treeId, nodeId) { var tree = igtree_getTreeById(treeId); var node = igtree_getNodeById(nodeId); _currentNodeId = nodeId; _currentNodeText = node.getText(); node.setText(_currentNodeText + ' [Loading...]'); }
johnllao 