Question

want to ask about void type, so I could know that it works or no

in PHP i could have a condition like this:

if(mysql_query($query))
{ bla bla }
else
{ print error }

how to do like that on ASP.NET?

i’m trying like this:

if (k.EditPassword(username.Text, oldPassTxt.Text, newPassTxt.Text) == true )
{
Response.Redirect("sample.aspx");
}
else
{ print error }

but of course, it cannot be like that, because void isn’t boolean

Answer 1

Usually void functions that do work that can fail will have some other way of informing you that they failed. Often they will throw an Exception:

try
{
    k.EditPassword(...)
}
catch(ApplicationException ex)
{
    // print Exception
}
Response.Redirect(...)

Other times they will set a status variable or something:

k.EditPassword(...)
if (k.Result == Result.OK)
    Response.Redirect(...)
else
    // print error...

Looking at documentation or source code for the conditions you are trying to handle is the only way to know how to handle it.