C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.InteropServices;

namespace YourNamespace
{
    internal static class NativeMethods
    {
        [DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
        internal static extern int StrCmpLogicalW(string aString, string bString);
    }

    internal class SortableList<T> : BindingList<T>
    {
        protected override bool SupportsSortingCore
        {
            get
            {
                return true;
            }
        }

        protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
        {
            int modifier = direction == ListSortDirection.Ascending ? 1 : -1;
            if (prop?.PropertyType.GetInterface("IComparable") != null)
            {
                var items = Items.ToList() as List<T>;
                items.Sort(new Comparison<T>((a, b) =>
                {
                    var aVal = prop.GetValue(a).ToString() as string;
                    var bVal = prop.GetValue(b).ToString() as string;
                    return NativeMethods.StrCmpLogicalW(aVal, bVal) * modifier;
                }));
                Items.Clear();
                foreach (var i in items) Items.Add(i);
            }
        }
    }
}

Quote:

C#

cnn = new MySqlConnection(connectionString);
cnn.Open();
...
cmd.Connection = cnn;
cnn.Open();
cmd.ExecuteNonQuery();

Quote:

SQL

select * from login where userid=@userid, password=@password, confirmpassword=@confirmpassword where loginid=@loginid is same

Quote:

C#

cmd.Parameters.AddWithValue("@userid", id);
//cmd.Parameters.AddWithValue("@employee_id", Convert.ToInt32(id));
cmd.Parameters.AddWithValue("@password", password);
//cmd.Parameters.AddWithValue("@confirmpassword", confirmpassword);