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Выход

public class ModelUser
{
    #region Model

    private string _username;
    private string _userpassword;
    private string _useremail;
    private int _userid;

    /// 

    /// 
    /// 
    public int userid
    {
        set { _userid = value; }
        get { return _userid; }
    }


    /// 

    /// 
    /// 

    public string username
    {
        set { _username = value; }
        get { return _username; }
    }

    /// 

    /// 
    /// 
    public string useremail
    {
        set { _useremail = value; }
        get { return _useremail; }
    }

    /// 

    /// 
    /// 
    public string userpassword
    {
        set { _userpassword = value; }
        get { return _userpassword; }
    }
    #endregion Model
}

public List DataTableToList(DataTable dt)
{
    List modelList = new List();
    int rowsCount = dt.Rows.Count;
    if (rowsCount > 0)
    {
        ModelUser model;
        for (int n = 0; n < rowsCount; n++)
        {
            model = new ModelUser();

            model.userid = (int)dt.Rows[n]["userid"];
            model.username = dt.Rows[n]["username"].ToString();
            model.useremail = dt.Rows[n]["useremail"].ToString();
            model.userpassword = dt.Rows[n]["userpassword"].ToString();

            modelList.Add(model);
        }
    }
    return modelList;
}

static DataTable GetTable()
{
    // Here we create a DataTable with four columns.
    DataTable table = new DataTable();
    table.Columns.Add("userid", typeof(int));
    table.Columns.Add("username", typeof(string));
    table.Columns.Add("useremail", typeof(string));
    table.Columns.Add("userpassword", typeof(string));

    // Here we add five DataRows.
    table.Rows.Add(25, "Jame", "Jame@hotmail.com", DateTime.Now.ToString());
    table.Rows.Add(50, "luci", "luci@hotmail.com", DateTime.Now.ToString());
    table.Rows.Add(10, "Andrey", "Andrey@hotmail.com", DateTime.Now.ToString());
    table.Rows.Add(21, "Michael", "Michael@hotmail.com", DateTime.Now.ToString());
    table.Rows.Add(100, "Steven", "Steven@hotmail.com", DateTime.Now.ToString());
    return table;
}

protected void Page_Load(object sender, EventArgs e)
{
    List userList = new List();

    DataTable dt = GetTable();

    userList = DataTableToList(dt);

    gv.DataSource = userList;
    gv.DataBind();
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