Binding of a list (of class type) with gridview needs the property from the class..why?

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see the example!!!

C#

public class ClsProduct
   {
       public string pName;

       public int pPrice;

   }

           ClsProduct objclsProduct1=new ClsProduct();
           objclsProduct.pName="apple";
           objclsProduct.pPrice=140;
           ClsProduct objclsProduct2=new ClsProduct();
           objclsProduct.pName="orange";
           objclsProduct.pPrice=70;
           List<ClsProduct> lst=new List<clsProduct>();
           lst.add(objclsProduct1);
           lst.add(objclsProduct2);
           GridView1.DataSource = lst;
           GridView1.DataBind();

it wont work !!!!

but...

C#

public class ClsProduct
    {
        public string pName
        {
          get;set; 
        }

        public int pPrice
        {
         get;set;
        }

    }

            ClsProduct objclsProduct1=new ClsProduct();
            objclsProduct.pName="apple";
            objclsProduct.pPrice=140;
            ClsProduct objclsProduct2=new ClsProduct();
            objclsProduct.pName="orange";
            objclsProduct.pPrice=70;

            List<ClsProduct> lst=new List<clsProduct>();
            lst.add(objclsProduct1);
            lst.add(objclsProduct2);
            GridView1.DataSource = lst();
            GridView1.DataBind();

this will work!!!

that means gridview will bind with properties but not with public variables...
Why ???

Posted 22-May-12 22:13pm

samu4u

Updated 22-May-12 22:23pm

v3

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4 solutions

Solution 1

Databinding could be done only with dependency properties! Please refer the following materials..

http://msdn.microsoft.com/en-us/library/ms752914.aspx

http://msdn.microsoft.com/en-us/library/ms752347.aspx

http://wpftutorial.net/DataBindingOverview.html

Posted 22-May-12 22:28pm

Jim Jos

Comments

samu4u 26-May-12 3:13am

5

Maciej Los 31-May-12 2:27am

Useful links, +5!

Jim Jos 31-May-12 2:29am

Thank you losmac!

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OriginalGriff · Accepted Answer · 2012-05-22T22:30:00

Because Properties and fields are very different things: fields are directly accessible variables, properties are accessed via a method call (or two in reality - one for get and one for set). Properties are accessed via Reflection when the data binding takes place, variables aren't.

There are other reasons, involving the INotifyPropertyChanged interface, but it gets kinda complicated so you would be best reading a good, think book on databinding! Unless you really need to know, just stick to the idea that Properties are exposed to databinding, and fields aren't.

You shouldn't be exposing Fields as public anyway! :D

Sandeep Mewara · Accepted Answer · 2012-05-22T22:32:00

Solution 3

This is because 'You can't databind against a variable.' This is one of the reasons why using Properties is helpful.

Read about properties here:
MSDN: Properties (C# Programming Guide)[^]
Why Properties Matter[^]

This is an interesting blog post: Properties vs. Public Variables[^]

Posted 22-May-12 22:32pm

Sandeep Mewara

Comments

VJ Reddy 23-May-12 4:36am

Nice answer. 5!

Sandeep Mewara 23-May-12 14:26pm

Thanks VJ.

Espen Harlinn 23-May-12 5:23am

5'ed!

Sandeep Mewara 23-May-12 14:26pm

Thanks Espen.

Maciej Los 31-May-12 2:24am

Good answer, my 5!

Sandeep Mewara 31-May-12 2:51am

Thanks.

VJ Reddy · Accepted Answer · 2012-05-22T22:35:00

Solution 4

The Data Binding concepts are explained here
http://support.microsoft.com/kb/307860[^]
http://msdn.microsoft.com/en-us/library/ms752347(v=vs.90).aspx[^]

Binding sources are explained here
http://msdn.microsoft.com/en-us/library/ms743643.aspx[^]

At the above reference it is stated that You can bind to public properties, sub-properties, as well as indexers, of any common language runtime (CLR) object.

and in the same reference it is stated that
You cannot bind to public fields.

Hence, due to the design philosophy of .NET data binding it is not possible to directly bind to the public fields.

Further as per the .NET frame work design guidelines it is stated Do not provide instance fields that are public or protected. as explained here http://msdn.microsoft.com/en-us/library/ms229057.aspx[^]

Posted 22-May-12 22:35pm

VJ Reddy

Comments

Espen Harlinn 23-May-12 5:24am

5'ed!

VJ Reddy 23-May-12 6:19am

Thank you, Espen :)

Mohammad A Rahman 23-May-12 6:24am

my 5!

VJ Reddy 23-May-12 6:26am

Thank you, Rahman :)

Mohamed Mitwalli 23-May-12 9:39am

5+

VJ Reddy 23-May-12 10:48am

Thank you, Mohamed :)

samu4u 24-May-12 3:15am

5

VJ Reddy 24-May-12 5:01am

Thank you, samu4u :)

Maciej Los 31-May-12 2:24am

Nice explanations. My 5!

VJ Reddy 31-May-12 2:54am

Thank you, losmac :)

Binding of a list (of class type) with gridview needs the property from the class..why?

4 solutions

Solution 1

Solution 2

Solution 3

Solution 4

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