สอบถามเรื่องนำค่าที่ได้จาก TextBox ใสใน GridView โดยที่ไม่ต้องเก็บลง Database ก่อน แต่เก็บไว้ใน ViewState

private DataTable dTable;
private DataRow dRow; 

protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack == false)
        {
            ViewState["dTable"] = new DataTable();
        }  
    }

protected void Button1_Click(object sender, EventArgs e)
{
string[] strCol = { "txt1", "txt2"};
        dTable = (DataTable)ViewState["dTable"];
        foreach (string str in strCol)
        {
            if (!dTable.Columns.Contains(str))
            {
                dTable.Columns.Add(str);
            }
        }
        dRow = dTable.NewRow();
        foreach (string str in strCol)
        {
            switch (str)
            {
                case "txt1":
                    dRow[str] = TextBox1.Text;
                    break;
                case "txt2":
                    dRow[str] = TextBox2.Text;
                    break;
            }
        }
        dTable.Rows.Add(dRow);
        ViewState["dTable"] = dTable;

        GridView1.DataSource = ViewState["dTable"];
        GridView1.DataBind();
 }

DataGridView.Rows.Add(textbox1,textbox2)

        Dim dt As New DataTable
        Dim dr As DataRow
		
	'*** Column ***'
        dt.Columns.Add("CustomerID")
        dt.Columns.Add("Name")
        dt.Columns.Add("Email")
        dt.Columns.Add("CountryCode")
        dt.Columns.Add("Budget")
        dt.Columns.Add("Used")
		
	'*** Rows ***'
	dr = dt.NewRow
	dr("CustomerID") = "C001"
	dr("Name") = "Win Weerachai"
	dr("Email") = "[email protected]"
	dr("CountryCode") = "TH"
	dr("Budget") = "1000000"
	dr("Used") = "600000"
	dt.Rows.Add(dr)
	
	Session("myCart") = dt

        Dim dt As DataTable = CType(Session("myCart"),DataTable)
        Dim dr As DataRow
			
	'*** Rows ***'
	dr = dt.NewRow
	dr("CustomerID") = "C003"
	dr("Name") = "Tony Stark"
	dr("Email") = "[email protected]"
	dr("CountryCode") = "US"
	dr("Budget") = "3000000"
	dr("Used") = "600000"
	dt.Rows.Add(dr)
	
	Session("myCart") = dt

   Me.GridView.DataSource = CType(Session("myCart"),DataTable) 
   Me.DataBid()

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

public partial class Default3 : System.Web.UI.Page
{
    private DataTable dTable;
    private DataRow dRow;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack == false)
        {
            ViewState["dTable"] = new DataTable();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string[] strCol = { "CategoryID", "CategoryName" };
        dTable = (DataTable)ViewState["dTable"];
        foreach (string str in strCol)
        {
            if (!dTable.Columns.Contains(str))
            {
                dTable.Columns.Add(str);
            }
        }
        dRow = dTable.NewRow();
        foreach (string str in strCol)
        {
            switch (str)
            {
                case "CategoryID":
                    dRow[str] = TextBox1.Text;
                    break;
                case "CategoryName":
                    dRow[str] = TextBox2.Text;
                    break;
            }
        }
        dTable.Rows.Add(dRow);
        ViewState["dTable"] = dTable;

        GridView1.DataSource = ViewState["dTable"];
        GridView1.DataBind();

        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            GridView1.Rows[i].Cells[0].HorizontalAlign = HorizontalAlign.Center;
            GridView1.Rows[i].Cells[1].HorizontalAlign = HorizontalAlign.Center;
            GridView1.Rows[i].Cells[2].HorizontalAlign = HorizontalAlign.Left;
        }
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            ImageButton l = (ImageButton)e.Row.FindControl("ImageButton1");

            l.Attributes.Add("onclick", "javascript:return " +
                 "confirm('คุณต้องการลบข้อมูล ใช่หรือไม่ " +
                 DataBinder.Eval(e.Row.DataItem, "CategoryID") + "')");
        }
    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        int categoryID = (int)GridView1.DataKeys[e.RowIndex].Value;
        DeleteRecordByID(categoryID); 
    }
    private void DeleteRecordByID(int categoryID)
    {
        Response.Write(categoryID);
        int Grid = GridView1.Rows.Count;
        for (int i = 0; i < Grid; i++)
        {
            if (categoryID != null)
            {
                GridView1.DeleteRow(categoryID);
            }
        }
        GridView1.DataBind();


    }
    protected void GridView1_RowDeleted(object sender, GridViewDeletedEventArgs e)
    {

    }
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "Delete")
        {
            int categoryID = Convert.ToInt32(e.CommandArgument);
            // Delete the record 
            DeleteRecordByID(categoryID);

        }
    }
}




    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <br />
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
    <asp:GridView ID="GridView1" runat="server" onrowcommand="GridView1_RowCommand" 
        onrowdatabound="GridView1_RowDataBound" onrowdeleted="GridView1_RowDeleted" 
        onrowdeleting="GridView1_RowDeleting">
        <Columns>
            <asp:TemplateField HeaderText="ลบ">
                <ItemTemplate>
                    <asp:ImageButton ID="ImageButton1" runat="server" 
                        ImageUrl="~/images/Delete_16x16.png" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

Customers.Rows[0].Delete();