SQL Membership show account is locked

Question

I have tried for a couple of hours to check whether the user account is locked or not since Membership.GetUser(Login1.UserName) always returns null.

Here is my code where I check the value in "OnLoginError" method:

protected void login_inError(object sender, EventArgs e)
{
    MembershipUser user = Membership.GetUser(Login1.UserName);
   //Membership.Providers["SqlProvider"].GetUser(Login1.UserName, false);

    if (user == null)
    {
        Login1.FailureText = "sorry there is no such username";
    }
    else
    {
        if (!user.IsApproved)
        {

            Login1.FailureText = "your account has been approved yet!!";
        }

        else if (user.IsLockedOut)
        {

            Login1.FailureText = "your account has been blocked";
        }

        else
        {

          Login1.FailureText = "sorry your password incorrect";             
        }
    }
}

Here is provider config:

<membership defaultProvider="SqlProvider">
    <providers>
        <!-- Add the new SqlMembershipProvider-->
        <add name="SqlProvider" type="System.Web.Security.SqlMembershipProvider"
             connectionStringName="ConnectionString" maxInvalidPasswordAttempts="3" 
             passwordAttemptWindow="1"
             passwordFormat="Hashed"
             applicationName="WebSite5"/>
    </providers>
</membership>