Delete rows from a dynamically created GridView

Hello 

I have the next code (which is creating a dynamically GridView from TextBox values)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Data.Sql;
using System.Web.Configuration;
using System.Text;

public partial class test1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    private void BindGrid(int rowcount)
    {
        //int MyIdentity = e.RowIndex;
        DataTable dt = new DataTable();
        DataRow dr;
        dt.Columns.Add(new System.Data.DataColumn("TextBox1Column", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("TextBox2Column", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("TextBox3Column", typeof(String)));

        if (ViewState["CurrentData"] != null)
        {
            for (int i = 0; i < rowcount + 1; i++)
            {
                dt = (DataTable)ViewState["CurrentData"];
                if (dt.Rows.Count > 0)
                {
                    dr = dt.NewRow();
                    dr[0] = dt.Rows[0][0].ToString();

                }
            }
            dr = dt.NewRow();
            dr[0] = TextBox1.Text;
            dr[1] = TextBox2.Text;
            dr[2] = TextBox3.Text;
            dt.Rows.Add(dr);

        }
        else
        {
            dr = dt.NewRow();
            dr[0] = TextBox1.Text;
            dr[1] = TextBox2.Text;
            dr[2] = TextBox3.Text;

            dt.Rows.Add(dr);

        }

        // If ViewState has a data then use the value as the DataSource
        if (ViewState["CurrentData"] != null)
        {
            GridView1.DataSource = (DataTable)ViewState["CurrentData"];
            GridView1.DataBind();
        }
        else
        {
            // Bind GridView with the initial data assocaited in the DataTable
            GridView1.DataSource = dt;
            GridView1.DataBind();

        }
        // Store the DataTable in ViewState to retain the values
        ViewState["CurrentData"] = dt;

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        {
            // Check if the ViewState has a data assoiciated within it. If
            if (ViewState["CurrentData"] != null)
            {
                DataTable dt = (DataTable)ViewState["CurrentData"];
                int count = dt.Rows.Count;
                BindGrid(count);
            }
            else
            {
                BindGrid(1);
            }
            TextBox1.Text = string.Empty;
            TextBox2.Text = string.Empty;
            TextBox3.Text = string.Empty;

            TextBox1.Focus();
        }
    }

    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        GridView1.DeleteRow(GridView1.SelectedIndex);
            
    }

}

(the code is from http://geekswithblogs.net/dotNETvinz/archive/2008/05/07/adding-multiple-columns-and-rows-in-gridview-without-using-a-again.aspx)

And i tried to add the 

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        GridView1.DeleteRow(GridView1.SelectedIndex);
    }

But i have the next error

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

The code from aspx page is

<asp:TextBox ID="TextBox1" runat="server"/><asp:TextBox ID="TextBox2" runat="server"/><asp:TextBox ID="TextBox3" runat="server"/><asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /><asp:GridView ID="GridView1" runat="server"
        OnRowDeleting="GridView1_RowDeleting"
        AutoGenerateDeleteButton="True"></asp:GridView>

and AutoGenerateDeleteButton is set to True.

Can you help me please to change the code so i can delete rows from the GridView

Thank you