//在数据库中查找是否有账号密码相同的用户
public bool isLoginSuccess(string account,string pwd)//参数是账号密码
{
SqlConnection conn = new SqlConnection("Data Source=192.168.0.10;Initial Catalog=GZCharge;User ID=sa;Password=szjj1995");
string strsql = "select * from TblUser where UserName = 'system' and PassWord = '12345'";
conn.Open();
SqlCommand com = new SqlCommand(strsql,conn);
SqlDataReader da = com.ExecuteReader();
bool isExit = da.HasRows;
conn.Close();
return isExit; //返回状态,true登录成功,false失败
}