Display Dropdown items in textbox

Take the one dropdown list and one textbox

set the both autopostback property=true

public void ddp1_SelectedIndexChanged(object Sender,EventArgs e)

{

txt.Text=ddp1.SelectedItem.ToString()/Text;

}

Simple if condition example in asp.net c#

Private Void button_click(object sender,EventArgs e)

{

if(textname.Text=="abc" && textpwd.Text=="123")

{

lbl.Text="Successfully login";

}

else

{

lbl.Text="sorry ";

}

}

how to display TextBox Value in Label

To Display any any TextBox Value in Label on Button Click Event Here is code

Public Void Button_click (object sender,EventAgrs e)
{
Label1.Text = TextBox1.Text;
}