protected void LinkButton1_Click(object sender, EventArgs e)
{
Author author = new Author();
if (author.CheckUser(txtID.Text))
{
Response.Write("<Script Language=JavaScript>alert(\"恭喜该用户名可用！\")</Script>");
}
else
{
Response.Write("<Script Language=JavaScript>alert(\"该用户名已注册！\")</Script>");
}
}