Question

我用Microsoft Visual Studio 2008编了一个登录界面，在调试时出现无法与数据库连接的错误，请求帮助一下

程序如下：
SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=D:\WebKDGLXT\App_Data\KDDB.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
conn.Open();
SqlCommand cmd = new SqlCommand("select UserName,UserPwd from UserInfo where UserName='" + txtUsername.Text.Trim().ToLower() + "'and UserPwd='" + txtUserPwd.Text.Trim() + "'", conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
Response.Redirect("Default.aspx");
}
else
{
Response.Write("<script>alert('用户名或密码错误！')</script>");
}
dr.Close();
conn.Close();

Answer 1

(@"Data Source=.\SQLEXPRESS;DataBase=KDDB;Integrated Security=True;Connect Timeout=30;User Instance=True");

Answer 2

与数据库连接字符串写的有问题，建议看看基础知识！