admin/ChangePwd.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;


public partial class admin_Default : System.Web.UI.Page
{
    private string sqlConString = ConfigurationManager.ConnectionStrings["LibraryConnectionString"].ToString();
    private SqlConnection sqlCon;
    private SqlCommand sqlCmd;

    private bool Check()
    {

        sqlCon = new SqlConnection(sqlConString);
        if (sqlCon.State == ConnectionState.Closed)
        {
            sqlCon.Open();
        }
        string selectCmd = "select * from tb_admin where username = '" + txtName.Text.Trim() + "'";
        SqlDataAdapter sqlDa = new SqlDataAdapter(selectCmd, sqlCon);
        DataSet ds = new DataSet();
        sqlDa.Fill(ds, "tb_admin");
        if (txtOldPwd.Text.Trim().ToLower() == ds.Tables[0].Rows[0][2].ToString())
        {
            return true;
        }
        else
        {
            if (sqlCon.State == ConnectionState.Open)
            {
                sqlCon.Close();
                sqlCon.Dispose();
            }
            return false;
        }

    }




    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            txtName.Text = Session["UserName"].ToString();
        }
    }

    protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {