i have a form mode authentication like this..

<authentication mode="Forms" >
<forms name="AuthName" loginUrl="/Login.aspx/" timeout="2" protection="All" path="/">
<credentials
passwordFormat="MD5">
          <user name="admin" password="admin"/>
        </credentials>
</forms>
<passport redirectUrl="Login.aspx"/>
</authentication>

From my login page if i try to access this credentials or validate this credentials its always returning false,
Iam checking this credentials like this

private void btnLogin_Click(object sender, System.EventArgs e)
{
if(FormsAuthentication.Authenticate(txtUserName.Te xt,txtUserPwd.Text))
{
FormsAuthentication.RedirectFromLoginPage(txtUserN ame.Text,chkRememberMe.Checked);
}
else
{
btnLogin.Text="Sorry Try again !";
}


even though iam giving "admin" and "admin" as username and password in login page its always going to else part rather than gng to redirect page.

plz help me in this regard

thanks in advance
vishnu