Hold temporary information in gridview before post-back

I have a Dialog (Modal), where I'll register one (or several) contact.

the contact goes to a gridview, where they may be edited or deleted.

the data in the Gridview, can only be saved in the database at the end of the process.

How can I achieve this?

Modal code

$(function () {
    $(".ModalBox").dialog({
        autoOpen: false,
        height: 400,
        resizable: false,
        draggable: false,
        width: 602,
        modal: true,
        open: function (type, data) {
            $(this).parent().appendTo($("form:first"));
        }
    });
});

OBS.:

• I don't have a good sample of CSharp or html code, 'cuz i don't know how to achieve this. All my code look messy atm (trying a lot of things already)

• My GridView is an ascx, and the modal is in the same ascx.

• I belive some temporary table, or something like this will help, but i never did something like it (looks like a shop cart software), and i don't even know how look开发者_如何学编程 for it.

Thank you. if you can do some code sample, it will be GREAT.

EDIT: i did this code:

CSharp code:

[Serializable]
        public class TabelaTempContato
        {
            public int IDCliente { get; set; }
            public string Nome { get; set; }
            public string Email { get; set; }
            public string Telefone { get; set; }
            public string Cpf { get; set; }
            public string Rg { get; set; }
            public string Departamento { get; set; }
            public string Cargo { get; set; }
        }

        protected List ListaTabelaTemp
        {
            get
            {
                if (this.ViewState["TabelaTemp"] == null)
                {
                    this.ViewState["TabelaTemp"] = new List();
                }

                return (List)this.ViewState["TabelaTemp"];
            }
        }

        protected void AddItem()
        {
            this.ListaTabelaTemp.Add(new TabelaTempContato());
            this.gvContato.DataSource = this.ListaTabelaTemp;
            this.gvContato.DataBind();
        }

        protected void btnTest_Click(object sender, EventArgs e)
        {
            this.AddItem();
        }

i create one temporary gridview, but the data is empty, i tried pull it from my text in the modal, but i was not able to, i'm i'm not familiar in how i'll get the data from gridview to my database. (i believe this is the easier part, then i not focused at it in the moment)

EDIT: I create the answer with my solution.

        [Serializable]
        public struct TempContato
        {
            public int IDCliente { get; set; }
            public string Nome { get; set; }
            public string Email { get; set; }
            public string Telefone { get; set; }
            public string Cpf { get; set; }
            public string Rg { get; set; }
            public string Departamento { get; set; }
            public string Cargo { get; set; }
        }

        protected List ListaTabelaTemp
        {
            get
            {
                if (this.ViewState["ListaTempContato"] == null)
                    this.ViewState["ListaTempContato"] = new List();

                return (List)this.ViewState["ListaTempContato"];
            }
        }

        protected void AddItem()
        {
            TempContato tempContato = new TempContato();

            //tempContato.IDCliente = Convert.ToInt32(this.txtEmailContato.Text);
            tempContato.Nome = this.txtNomeContato.Text;
            tempContato.Email = this.txtEmailContato.Text;
            tempContato.Telefone = this.txtTelefoneContato.Text;
            tempContato.Cpf = this.txtCpfContato.Text;
            tempContato.Rg = this.txtRgContato.Text;
            tempContato.Departamento = this.ddlDepartamentoContato.SelectedValue;
            tempContato.Cargo = this.ddlCargoContato.SelectedValue;

            this.ListaTabelaTemp.Add(tempContato);
        }

        protected void AtualizarGrid()
        {
            this.gvContato.DataSource = this.ListaTabelaTemp;
            this.gvContato.DataBind();
        }

        protected void btnTest_Click(object sender, EventArgs e)
        {
            this.AddItem();
            this.AtualizarGrid();
        }

Now i get the values from my modal! Just need a couple of things now (i belive).

1- Get the data in my database to load the GridView for the first time (if it's an edition), and load with the new temp data.

2- Save the new temp data.

DONE:

1- i load in my viewstate and use it to load the grid.

2- also using my viewstate to save my data, in the database.