Interview Questions on ViewState ASP.NET

FAQS on ViewState Page 2

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11. Can you programmatically store and retrieve data from ViewState?
Yes, In Asp.Net you can store and retrieve data from ViewState. Example: //Save the text in ViewState ViewState[“Name”] = txtFirstName.Text + txt.LastName.Text //Retrieve the data String name = ViewState[“Name”].ToString();
12. Can I store DataSet in ViewState?
Yes DataSet ds = new DataSet(); // write code to fill the DataSet //Store DataSet in ViewState ViewState["CustomerData"] = ds;
13. Can I store any custom class object in a ViewState?
Yes, The class should be marked with [Serializable] attribute. For Example: [Serializable] class Employee { int empId; Public int EmployeeID { get { return empid; } set {empid = value; } } } //Create an object of Employee class Employee empObj = new Employee(); empObj.EmployeeID = 1000; //Store Employee class object in ViewState ViewState["emp"] = empObj; //Retrieve Employee class object from ViewState Employee xyz = (Employee) ViewState["emp"];
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