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Posts Tagged ‘C#’

Updatepanel triggers another updatepanel

August 18, 2017 Leave a comment

updatepanel

By default, every UpdatePanel will be refreshed during every asynchronous post back.

Some important remarks about Update Panel

When an UpdatePanel control is not inside another UpdatePanel control, the panel is updated according to the settings of the UpdateMode and ChildrenAsTriggers properties, together with the collection of triggers. When an UpdatePanel control is inside another UpdatePanel control, the child panel is automatically updated when the parent panel is updated.

The content of an UpdatePanel control is updated in the following circumstances:

  • If the UpdateMode property is set to Always, the UpdatePanel control’s content is updated on every postback that originates from anywhere on the page. This includes asynchronous postbacks from controls that are inside other UpdatePanel controls and postbacks from controls that are not inside UpdatePanel controls.
  • If the UpdatePanel control is nested inside another UpdatePanel control and the parent update panel is updated.
  • If the UpdateMode property is set to Conditional, and one of the following conditions occurs:
    • You call the Update method of the UpdatePanel control explicitly.
    • The postback is caused by a control that is defined as a trigger by using the Triggers property of the UpdatePanel control. In this scenario, the control explicitly triggers an update of the panel content. The control can be either inside or outside the UpdatePanelcontrol that defines the trigger.
    • The ChildrenAsTriggers property is set to true and a child control of the UpdatePanel control causes a postback. A child control of a nested UpdatePanel control does not cause an update to the outer UpdatePanel control unless it is explicitly defined as a trigger.

 

Following is the example of code with UpdateMode property set to Conditional.

updatePanelCondition

Hope it helps !

 

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C# 7.0


C# History

In all previous versions of C# (with the exception of C# 6.0 maybe) new features have revolved around a specific theme:

  • C# 2.0 introduced generics.
  • C# 3.0 enabled LINQ by bringing extension methods, lambda expressions, anonymous types and other related features.
  • C# 4.0 was all about interoperability with dynamic non-strongly typed languages.
  • C# 5.0 simplified asynchronous programming with the async and await keywords.
  • C# 6.0 had its compiler completely rewritten from scratch, and introduced a variety of small features and improvements that were easier to implement now.

C# 7.0 is no exception to this rule. The language designers were focusing on three main themes:

  • Working with Data – Increased usage of web services is changing the way data is being modelled. Instead of designing the data models as a part of the application, their definition is becoming a part of web service contracts. While this is very convenient in functional languages, it can bring additional complexity to object oriented development. Several C# 7.0 features are targeted at making it easier to work with external data contracts.
  • Improved Performance – Increased share of mobile devices is making performance an important consideration again. C# 7.0 introduces features that allow performance optimizations, which were previously not possible in the .NET framework.
  • Code simplification – Several additional small changes built on the work done for C# 6.0 to allow further simplification of the code written.

Using the code

Tuples (with types and literals)

Return multiple values from a method is now a common practice, we generally use custom datatype, out parameters, Dynamic return type or a tuple object but here C# 7.0 brings tuple types and tuple literals for you it just return multiple values/ multiple type inform of tuple object. see below snippet

( string, string, string, string) getEmpInfo()
{
    //read EmpInfo from database or any other source and just return them
    string strFirstName = "abc";
    string strAddress = "Address";
    string strCity= "City";
    string strState= "State";
     return (strFirstName, strAddress, strCity, strState); // tuple literal
}

//Just call above method and it will return multiple values 
 var empInfo= getEmpInfo();
WriteLine("Emp info as  {empInfo .Item1} {empInfo .Item2} {empInfo .Item3} {empInfo .Item4}.");

In above sample we can easily retrieve multiple values from tuples, but Item1, Item2 name are bit ir-relevant so let’s assign some meaningful names before return, see below sample

(string strFName, string strAdd, string strC, string strSt) getEmpInfo()
{
    //code goes here
}

//Now when you call method get values with specific name as below 
var empInfo= getEmpInfo();
WriteLine("Emp info as {empInfo.strFName} {empInfo.strAdd} {empInfo.strC} {empInfo.strSt}.");

Additionally you can return their name directly in tuple literal as below

return (strFName: strFirstName, strAdd: strAddress, strCity: strC, strState: strSt);

Tuples are very useful thing where you can replace hash table or dictionary easily, even you can return multiple values for a single key, Additionally you can use it instead of List where you store multiple values at single position.

.NET also has a Tuple type (See here) but it is a reference type and that leads to performance issue, but C# 7.0 bring a Tuple with value type which is faster in performance and a mutable type.

Deconstruction

Most of the time we don’t want to access whole tuple bundle or we just need internal values then we can use Deconstruction features of C# 7.0, we can easily de-construct a tuple and fetch values that we need, following snippet will clear your doubt

( string strFName,  string strAdd,  string strC, string strSt) = getEmpInfo(); 
Console.WriteLine($"Address: { strAdd }, Country: { strC }");

Record Type

C# support record type, which is nothing but a container of a properties and variables, most of the time classes are full with properties and variables, we need lot of code to just declare them but with the help of Record Type you can reduce your effort, see below snippet

class studentInfo
{
    string _strFName;
    string _strMName;
    string _strLName;
    studentInfo(string strFN, string strMN, string strLN){
        this._strFName = strFN;
        this._strMName = strMN;
        this._strLName = strLN;
    }
    public string StudentFName {get{ return this._strFName;}}
    public string StudentMName {get{ return this._strMName;}}
    public string StudentLName {get{ return this._strLName;}}
}

In above code we have a class with property, constructor and variable, so access and declare variable i need to write more code.

To avoid it i can use  Record Type in C#, see below snippet

class studentInfo(string StudentFName, string StudentMName, string StudentLName);

That’s it and we have Done !

above snippet produce same output as earlier snippet.

 

Minimizing OUT

Out parameter is very popular when we want to return multiple values from method, By nature out parameters are ref type and works as an argument, we can use it easily but the only condition is out variable should be initialized before it passed. see below snippet

class SetOut
{
    void AssignVal(out string strName)
    {
        strName = "I am from OUT";
    }
    static void Main()
    {
        string strArgu;
        AssignVal(out strArgu);
        // here contents of strArgu is "I am from OUT"
    }
}

C# 7.0 reduce your pain of writing extra code and you can just pass argument without initialize them, see below snippet

pat

  static void Main()
    {
        AssignVal(out string szArgu);
        // here contents of szArgu is "I am from OUT"
    }

You can either use var as argument type instead to declare them.

Note that variable are used here, are in limited scope only, thus we can not use them outside method

Since we can define variable as argument directly, C# 7.0 gives us freedom to declare them as var also. so you don’t need to worry about datatype, see below snippet

  static void Main()
    {
        AssignVal(out var szArgu);
        // here contents of szArgu is "I am from OUT"
    }

 

Non-‘NULL’ able reference type

Null reference is really a headache for all programmers, it is a million dollar exception. If you don’t check them you got runtime exception or if you check them for each object then your code goes long and long, To deal with this problem C# 7.0 come with non-nullable reference types

**I think syntax for it yet not fixed still they have release following syntax

?‘ is for nullable value-type and ‘!‘ is for non-nullable reference type

int objNullVal;     //non-nullable value type
int? objNotNullVal;    //nullable value type
string! objNotNullRef; //non-nullable reference type
string objNullRef;  //nullable reference type

Now look at the following complier effect after we run this snippet

MyClass objNullRef;  // Nullable reference type
MyClass! objNotNullRef; // Non-nullable reference type
 
objNullRef = null;   // this is nullable, so no problem in assigning
objNotNullRef = null;   // Error, as objNotNullRef is non-nullable
objNotNullRef = objNullRef;      // Error, as nullable object can not be refered
 
WriteLine(objNotNullRef.ToString()); // Not null so can convert to tostring
WriteLine(objNullRef.ToString()); // could be null
 
if (objNullRef != null) { WriteLine(objNullRef.ToString); } // No error as we have already checked it
WriteLine(objNullRef!.Length); // No error

 

Local Methods/Functions

 

Local methods and functions is already there in current version of C# (Yes, we can achieve them using Func and Action types, see here Func  and Action), but still there are some limitations to local method, we can not have following features in it

  • Generic
  • out parameters
  • Ref
  • params

Now with C# 7.0 we can overcome this problems, see below snippet

private static void Main(string[] args)
{
    int local_var = 100;
    int LocalFunction(int arg1)
    {
        return local_var * arg1;
    }
 
    Console.WriteLine(LocalFunction(100));
}

in above snippet we have define ‘LocalFunction’ as local function which is inside Main Function ‘Main’, here we can use out or ref in it.

Readability Improvement with Literals

Many times we use literals in code, if they are too long then we might loose Readability,   to sort out such issues C# 7.0 comes with some improvement in Literals. Now C# allows ‘_‘ (underscore) in Literals for betterment of understand, it does not effect on its value. see below snippet

 var lit1 = 478_1254_3698_44;
 var lit2 = ab0Xab_bc47at_XY;

//C# also come with binary literal for bunary values

 var binLit = 1100_1011_0100_1010_1001;

**Literals are nothing but a constant value (hard-coded value) which may be with predefined meaning. (Litearls in C#)

Pattern matching

C# 7.0 allows user to use pattern in IS statement and with SWITCH statement, so we can match pattern with any datatype, patterns can be constant patterns, Type patterns, Var patterns. following sample snippet will clear your concepts, let’s start with IS pattern

 public  void Method1( object obj)
{
    //following null is constant pattern
     if (obj  is null)  return;
    //datatype pattern, string is datatype that we check directly     
     if (obj  is  string st)
    { //code goes here }
    else
    return; 
}

Switch pattern helps a lot as it uses any datatype for matching additionally ‘case’ clauses also can have its pattern so it bit flexible implementation

see below snippet

class Calculate();
class Add(int a, int b, int c) : Calculate;
class Substract(int a, int b) : Calculate;
class Multiply(int a, int b, int c) : Calculate;
 
Calculate objCal = new Multiply(2, 3, 4);
switch (objCal)
{
    case Add(int a, int b, int c):
        //code goes here
        break;
    case Substract(int a, int b):
        //code goes here
        break;
    case Multiply(int a, int b, int c):
        //code goes here
        break;
    default:
        //default case
        break;
}

in above sample switch case checks pattern and call ‘Multiply’ method

‘return’ by Ref

Have you tried to return your variable from method/function as Ref ? Yes, C# 7.0 allows you to do that. Infect you can pass a variable with Ref return them as Ref  and also store them as Ref, isn’t it amazing.

see below snippet

ref string getFromList(string strVal, string[] Values)
{
 foreach (string val1 in Values)
 {
     if (strVal == val1)
        return ref val1; //return location as ref not actual value
 }
}

string[] values = { "a", "b", "c", "d" };
ref string strSubstitute = ref getFromList("b", values);
strSubstitute = "K"; // replaces 7 with 9 in the array
System.Write(values[1]); // it prints "K"

In above sample we have find and replace a string, by return a Ref from method.

Throw Exception from Expression

You read it right, in C# 7.0 Now you can throw exception from your expression directly. see below snippet

public string getEmpInfo( string EmpName)
    {
        string[] empArr = EmpName.Split(",");
        return (empArr.Length > 0) ? empArr[0] : throw new Exception("Emp Info Not exist");
    }

In above snippet we can directly throw exception from return statement, isn’t it really good !

Point to be Notice

All above features are expected to be a part of C# 7.0, yet Microsoft has release some of it with Visual studio 2015 Release 4.

Hope you enjoy these new features of C# 7.0.

Categories: ASP.NET Tags: , ,

Modify Collection while Iterating C#

May 10, 2017 1 comment

The general rule is that you can’t modify a collection/array/list while iterating over it.

If you are trying to modify loop while iterating you will get following error message

List strList = new List();

strList.Add(“1”);
strList.Add(“2”);
strList.Add(“3”);
strList.Add(“4”);

foreach(string str in strList)
{
strList.Add(“test”);
}

Error:

System.InvalidOperationException: Collection was modified; 
enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at Rextester.Program.Main(String[] args)

Here is the simple solution

int listLength = strList.Count();

for(int i=0; i<listLength; i++)
{

//Add New Element
if(i == 0)//Some codition when you want to add new element to list/array
{
listLength++;
strList.Add(“5”);
}

Console.WriteLine(strList[i]);
}

Hope it helps !

Set focus on textbox

November 16, 2016 Leave a comment

Using Jquery

$(function() {
  $("#Box1").focus();
});

Using Javascript
window.onload = function() {
  document.getElementById("Box1").focus();
};

HTML5 

http://www.codeproject.com/members/flair/8524963

Categories: ASP.NET, Code Project Tags: , , ,

File Download code in vb.net


If Not String.IsNullOrEmpty(strURL) Then
Dim req As New WebClient()
Dim response As HttpResponse = HttpContext.Current.Response
response.Clear()
response.ClearContent()
response.ClearHeaders()
response.Buffer = True
response.AddHeader(“Content-Disposition”, “attachment;filename=””” + Server.MapPath(strURL) + “”””)
Dim data As Byte() = req.DownloadData(Server.MapPath(strURL))
response.BinaryWrite(data)
response.[End]()
End If

 

Hope it helps !

Full form

March 30, 2015 Leave a comment

WSDL : Web Services Description Language
REST : Representational State Transfer
SOAP : Simple Object Access Protocol

..Will add some more soon

Deep and Shallow Copying, Difference of Shallow and Deep Copying

December 16, 2014 Leave a comment

What is Shallow Copy?

Shallow copy is a bit-wise copy of an object. A new object is created that has an exact copy of the values in the original object. If any of the fields of the object are references to other objects, just the reference addresses are copied i.e., only the memory address is copied.

What is Deep Copy?

A deep copy copies all fields, and makes copies of dynamically allocated memory pointed to by the fields. A deep copy occurs when an object is copied along with the objects to which it refers.

When creating copies of arrays or objects one can make a deep copy or a shallow copy. This explanation uses arrays.

Recall array variables in Java are references or pointers. A shallow copy can be made by simply copying the reference.

public class Ex{
private int[] data;

public Ex(int[] values){
data = values;
}

public void showData(){
System.out.println( Arrays.toString(data) );
}
}

The above code shows shallow copying. data simply refers to the same array as vals.

Shallow

This can lead to unpleasant side effects if the elements of values are changed via some other reference.

public class UsesEx{
public static void main(String[] args){
int[] vals = {-5, 12, 0};
Ex e = new Ex(vals);
e.showData(); // prints out [-5, 12, 0]
vals[0] = 13;
e.showData(); // prints out [13, 12, 0]
// Very confusiin, because I didn’t intentionally change anything about the
// object e refers to.
}
}

A deep copy means actually creating a new array and copying over the values.

public class Ex{
private int[] data;

public Ex(int[] values){
data = new int[values.length];
for(int i = 0; i < data.length; i++)
data[i] = values[i];
}

public void showData(){
System.out.println( Arrays.toString(data) );
}
}

The above code shows deep copying.

deep

Changes to the array values refers to will not result in changes to the array data refers to.