checking hidden field is empty or not

i开发者_运维问答 have a

<asp:HiddenField runat="server" ID="ListTwoHiddenField" />

i have some programming aspect how can i check whether hidden field is empty or not i mean i want to check that ListTwiHiddenField.items.cout==0 or empty how can i check this

HiddenFields don't have an Items collection, they just have a Value property, which is a String. So to check if it's empty all you need is:

if (string.IsNullOrEmpty(ListTwoHiddenField.Value)
{
}

Or you could use string.IsEmptyOrWhitespace, which would check whether the hidden field's value is just [space] characters.

    dont check for NUll and Empty in one line 
    like this
    if(HiddenObj.Value != null || HiddenObj.Value.Length > 0)
    {
       //hidden object is not null and have length more than zero that means have some content
    }
    else
    {
    //hidden object is null or have length empty
    }

    this thing is going to fail 
    try like this 
    if(HiddenObj.Value != null)
    {
       if(HiddenObj.Value.Length > 0)
         {
         //hidden object is not null and have length more than zero that means have some content
         }else
        {
         // hidden object value is empty 
        }


    }else
    {
     // hidden object is Null 
    }

// from santosh kakani

you just need to check :

if(ListTwoHiddenField.Value != String.Empty)
{
    //do code
}

No need for checking null also. if you are adding hidden field to aspx page. when page controls initialize itself it will also initialize.