登录次数验证，可能还是有些不足的，希望大家指正

protected void BtnLogin_Click(object sender, EventArgs e)
{
string ConStr = ConfigurationManager.ConnectionStrings["ConStr"].ToString();
string GetNameSql = "SELECT [Title] FROM [dbo].[Info] WHERE [Title]='" + this.TxtName.Text+"'";
string GetPwdSql = "SELECT [Details] FROM [dbo].[Info] WHERE [Details]='" + this.Txtpwd.Text + "'";

string Name = string.Empty;
string Pwd = string.Empty;
using(SqlConnection conn=new SqlConnection(ConStr))
{
conn.Open();
SqlCommand Pwdcomm = new SqlCommand(GetPwdSql, conn);
Pwd = Convert.ToString(Pwdcomm.ExecuteScalar());
SqlCommand Namecomm = new SqlCommand(GetNameSql,conn);
Name = Convert.ToString(Namecomm.ExecuteScalar());

if (Name == this.TxtName.Text && Pwd == this.Txtpwd.Text)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('登陆成功！');</script>");
}
else
{
Response.Write("<script>alert('登陆失败！');</script>");
//Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('登陆失败！');</script>");
}

if ((Name == this.TxtName.Text && Pwd != this.Txtpwd.Text) || (Name != this.TxtName.Text && Pwd == this.Txtpwd.Text))
{
Session["count"] = Convert.ToInt32(Session["count"]) + 1;
}
if (Convert.ToInt32(Session["count"]) > 3)
{
string UpdateTime = "SELECT Datediff(minute, [LoginDate], GetDate()) FROM [Info] WHERE Title='" + this.TxtName.Text+"'";
SqlCommand comm = new SqlCommand(UpdateTime,conn);
string countMiuntes=(30-Convert.ToInt32(comm.ExecuteScalar())).ToString();
if (Convert.ToInt32(countMiuntes) > 0)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('登陆超过三次失败！距离解禁还有" + countMiuntes + "分钟');</script>");
}
if (Convert.ToInt32(countMiuntes) <= 0)
{
string GetNowTime = "UPDATE [Info] SET [LoginDate]='" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + "' WHERE Title='" + this.TxtName.Text + "'";
SqlCommand commtime = new SqlCommand(GetNowTime, conn);
if (commtime.ExecuteNonQuery() > 0)
{
Session.RemoveAll();
}
}
}
}
}