Paging in DataGrid

Go to Property Builder - > Paging - > Check Allow Paging and set properties according to your choice.

protected void DataGrid_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
{
DataGrid.CurrentPageIndex = e.NewPageIndex;
//Rebind your grid here
DataGrid.DataSource=DataSource;
DataGrid.DataBind();
}

Javascript to open popup window

< script type=" text/javascript " >

var w = screen.availWidth; //For Screen Width
var h = screen.availHeight; //For Screen Height
var Width = (w-100); //
var Height = (h-100);
var left = (w-Width)/2;
var top = (h-Height)/2;

window.open(Path, 'NameOfWindow', 'width='+ Width +', height='+ Height +',top='+ top +',left='+ left +', menubar=no, resizable=no,scrollbars=yes')


< / script >

Boxing and UnBoxing

Converting a value type to reference type is called Boxing. Unboxing is an explicit operation.


Example :

class A
{
static void Main()
{
int i = 1;
object o = i; // boxing
int j = (int) o; // unboxing
}
}

PUre object oriented language

PUre object oriented language must support these properties.

1. Encapsulation/Information Hiding
2. Inheritance
3. Polymorphism/Dynamic Binding
4. All pre-defined types are Objects
4. All operations performed by sending messages to Objects
5. All user-defined types are Objects

Javascript on asp.net page

Suppose you want to call some javascript on click of any asp.net button after executing some asp code , you can register javascript and get executed .


string javaScript = " ( script language=' javascript' ) window.close( ) (/script) "; Page.RegisterStartupScript("myScript", javaScript);

This will close the window where this code will be executed.

Javascript data types

1.Number
2.String
3.Boolean
4.Function
5.Object
6.Null
7.Undefined

isNaN

Return true if the argument is not a number

Javascript to check if user input has digit in it.

function HasDigit(txt)
{
strLen = txt.length;

for(i=0 ; i < strLen ; i++ )
{
if( (txt.charAt(i)=="0") || (txt.charAt(i)=="1") || (txt.charAt(i)=="2") || (txt.charAt(i)=="3") ||
(txt.charAt(i)=="4") || (txt.charAt(i)=="5") || (txt.charAt(i)=="6") || (txt.charAt(i)=="7") ||
(txt.charAt(i)=="8") || (txt.charAt(i)=="9"))
{
return true;
}
}
return false;

}