how to acess save as dialog box

sir i am asking save as dialog box need in one button click not this one i am entered this type using in my project.

so i am using html input type source code using in my project . so i want this type output need plaese check sent it..

itzz an urgent help me sir./....

i am using one button click

after that source code is this plz check it..

protected void Button1_Click(object sender, EventArgs e)

{

string path = @"c:\";

System.Diagnostics.Process.Start(path);

}

i need save as dialog box in html source code but im use only single button only my project ... i waiting ur reply sir

i am using visual studio2012 in c# web using