Here Mudassar Ahmed Khan has explained with an example, how to use ViewState variable inside JavaScript in ASP.Net with C# and VB.Net.

ViewState is a Server Side class object which though stores the data on Client Side but it is in Encrypted Form (Hashed format) and hence cannot be read by Plain JavaScript.

Thus the ViewState variable is accessed inside JavaScript code with the help of Server Side Code Blocks in ASP.Net with C# and VB.Net.

Here Mudassar Ahmed Khan has explained with an example, how to store (save) Temporary data in GridView in ASP.Net using C# and VB.Net.

When the Add Button is clicked, the data from the TextBoxes will be inserted into a DataTable which will be stored (saved) in ViewState and later used to populate the GridView in ASP.Net using C# and VB.Net.

Here Mudassar Ahmed Khan has explained with an example, how to use Page_ClientValidate function with JavaScript in ASP.Net.

Page_ClientValidate is an ASP.Net JavaScript function in-built which is used to perform ASP.Net validation explicitly i.e. invoking the ASP.Net Validators using JavaScript.

For example, in order to make the RequiredFieldValidator work with OnClientClick we need to make use of Page_ClientValidate JavaScript function in ASP.Net.

Here Mudassar Ahmed Khan has explained with an example, how to call Controller's Action method with Parameter on Button Click in ASP.Net MVC Razor.

When the Submit Button is clicked, the Form will be submitted and the data inside the Form will be sent to the Controller's Action method as parameter using Model class object in ASP.Net MVC Razor.