Viewdata and viewbag in Asp.net MVC

Simple comparison:

Viewdata	Viewbag
It is a collection of key/value dictionaries.	It is a dynamic type object.
From Asp.net MVC 1.	ASP. NET mvc3
Based on ASP.net 3.5 framework	Based on ASP.net 4.0 and. NET Framework
Viewdata is faster than viewbag	Viewbag is slower than viewdata
The appropriate data type needs to be converted when querying data in viewpage.	No type conversion is required when querying data in viewpage.
There are some types of conversionsCode	Better readability

Use viewdata In the controller: Public Actionresult usingviewdata ()
{
Viewdata [ " Title " ] = " Using viewdata " ;
Viewdata [ " Projectname " ] = " My test project " ;
Viewdata [ " Projectdescription " ] = " This is test project to demo viewdata and viewbag details " ;
Viewdata [ " Startdate " ] = New Datetime ( 2011 , 1 , 1 );
Viewdata [ " Totalprice " ] = 1000 ;
Viewdata [ " Totaldays " ] = 100 ;

Dictionary < String , String > Stackholder = New Dictionary < String , String > ();
Stackholder. Add ( " Client " , " Mr. Client " );
Stackholder. Add ( " Manager " , " Mr. Joy " );
Stackholder. Add ( " Team Leader " , " Mr. Toy " );
Stackholder. Add ( " Sr. developer " , " Mr. dojoy " );
Stackholder. Add ( " Developer " , " Mr. nodoy " );
Viewdata [ " Stackholder " ] = Stackholder;

List < String > Modules = New List < String > ();
Modules. Add ( " Admin Module " );
Modules. Add ( " Shoppingcart Module " );
Modules. Add ( " CMS Module " );
Viewdata [ " Modules " ] = Modules;
Return View ();
)

Cshtml corresponding to usingviewdata View:

<H1> @ viewdata [ " Title " ] </H1>
<Div>
<Div>
<H2> Project name: @ viewdata [ " Projectname " ] </H2>
</Div>
<Div>
Projectdescription:
<P> " @ Viewdata [ " Projectdescription " ] " . </P>
</Div>
<Div>
Stack holder:
<Br/>

<Ul id = " Stakholder " >
@ Foreach ( VaR Stakerholder In Viewdata [ " Stackholder " ] As Dictionary < String , String >)
{
<Li>
@ Stakerholder. Key & nbsp;: @ stakerholder. Value
</LI>
}
</Ul>
</Div>
<Div>
Project details: <br/>
<Div>
Module list:
<Ul id = " Modulelist " >
@ Foreach ( VaR Module In Viewdata [ " Modules " ] As List < String >)
{
<Li>
@ Module
</LI>
}
</Ul>

</Div>
Project startdate: @ viewdata [ " Startdate " ] <Br/>
Project totalprice: @ viewdata [ " Totalprice " ] <Br/>
Project totadays: @ viewdata [ " Totaldays " ]
</Div>
</Div>

 

Then viewbag:

 

Public Actionresult usingviewbag ()
{
Viewbag. Title = " Using viewbag " ;
Viewbag. projectname = " My test project " ;
Viewbag. projectdescription = " This is test project to demo viewdata and viewbag details " ;
Viewbag. startdate = New Datetime ( 2011 , 1 , 1 );
Viewbag. totalprice = 1000 ;
Viewbag. totaldays = 100 ;

Dictionary < String , String > Stackholder = New Dictionary < String , String > ();
Stackholder. Add ( " Client " , " Mr. Client " );
Stackholder. Add ( " Manager " , " Mr. Joy " );
Stackholder. Add ( " Team Leader " , " Mr. Toy " );
Stackholder. Add ( " Sr. developer " , " Mr. dojoy " );
Stackholder. Add ( " Developer " , " Mr. nodoy " );
Viewbag. stackholder = stackholder;

List string modules = New List string ();
modules. add ( " admin module " );
modules. add ( " shoppingcart module " );
modules. add ( " CMS module " );
viewbag. modules = modules;
return View ();
}viewbag of cshtml corresponding to view usingviewbag:

@ viewbag. title

<Div>
<Div>
<H2> Project name: @ viewbag. projectname </H2>
</Div>
<Div>
Projectdescription:
<P>"@ Viewbag. projectdescription. </P>
</Div>
<Div>
Stack holder:
<Br/>

<Ul id = " Stakholder " >
@ Foreach ( VaR Stakerholder In Viewbag. stackholder)
{
<Li>
@ Stakerholder. Key & nbsp;: @ stakerholder. Value
</LI>
}
</Ul>
</Div>
<Div>
Project details: <br/>
<Div>
Module list:
<Ul id = " Modulelist " >
@ Foreach ( VaR Module In Viewbag. modules)
{
<Li>
@ Module
</LI>
}
</Ul>

</Div>
Project startdate: @ viewbag. startdate. tostring ( " DD-mmm-yyyy " ) <Br/>
Project totalprice: @ viewbag. totalprice? <Br/>
Project totadays: @ viewbag. totaldays
</Div>
</Div>

From: http://www.cnblogs.com/Gnepner/archive/2012/05/05/2484545.html