Difference Between Eval And Bind in asp.net

Eval is Unidirectional where as Bind is Bi-Directional.
Eval can combine more than two filed where as Bind can not do this Operation.

Why use Microsoft Sql server with Asp.net in Back end ?

There are many Database System Available e.g Microsoft Access, Oracle,Mysql,Microsoft SqlServer. The Main Point is that Microsoft SqlServer is Server So it can Handle multiple request at time. Oracle is also server but Microsoft SqlServer is in build install with .Net so with Oracle we need more Space that's why We Choice Microsoft SqlServer with ASP.NET Back End.

Password TextBox blank when Page Refresh or Button Click in asp.net

Password TextBox blank when Page Refresh or Button Click in asp.net
This is Very Series Problem when Register form Submit or Refresh Page or any DropDownList PostBack . Simple Solution of this Problem is

protected void Page_Load(object sender, EventArgs e)
{
txtPassword.Attributes.Add("Value", txtPassword.Text);

}

Eval data Binding Method for Adding two Field in One for C sharp or VB.Net

(int)Eval("Datafield1")+ (int)Eval("Datafield2")