how to get dynamically created textbox values in gridview in asp.net

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C#

ASP.NET

Gridview

hi,
i have creating specific no of dynamic textboxes in gridview. i need to get those textboxes id's and textbox values. here i'm entering textbox values at the runtime, i want to compute those text box values please help me with this...

protected void creategridview()
        {
            int number = a;
            DataTable dt = new DataTable();
            dt.Columns.Add("SerialNumber", typeof(string));
            dt.Columns.Add("MIN", typeof(string));
            dt.Columns.Add("MAX", typeof(string));
           // dt.Columns.Add("UNIT", typeof(string));
            dt.Columns.Add("Value", typeof(double));
            dt.Columns.Add("Result", typeof(string));
            for (int i = 0; i < number; i++)
            {
                dt.Rows.Add("", "", null);
            }
            gridview1.DataSource = dt;
            gridview1.DataBind();
        }
        protected void generaterow()
        {
            this.creategridview();
            int numbers = a;
            string serialno = b;
            string newserialno = serialno.Substring(0, serialno.Length - 1);
            int cellcnt = this.gridview1.Rows[0].Cells.Count;
            int rowcount = this.gridview1.Rows.Count;
                foreach (GridViewRow row in this.gridview1.Rows)
                {
                    Label label1 = new Label();
                    label1.ID = newserialno + (Convert.ToInt32(row.RowIndex + 1)).ToString();
                    label1.Text = newserialno + (Convert.ToInt32(row.RowIndex + 1)).ToString();
                    label1.Attributes.Add("runat", "server");
                    label1.CssClass = "color";
                    row.Cells[0].Controls.Add(label1);
                    //label2
                    Label label2 = new Label();
                    label2.ID = newserialno + (Convert.ToInt32(row.RowIndex + 1)).ToString();
                    label2.Text = min.ToString();
                    label2.Attributes.Add("runat", "server");
                    label2.CssClass = "color";
                    
                    row.Cells[1].Controls.Add(label2);
                    //label3
                    Label label3 = new Label();
                    label3.ID = newserialno + (Convert.ToInt32(row.RowIndex + 1)).ToString();
                    label3.Text = max.ToString();
                    label3.Attributes.Add("runat", "server");
                    label3.CssClass = "color";
                   
                    row.Cells[2].Controls.Add(label3);
                    //textbox1
                    TextBox textbox1 = new TextBox();
                    textbox1.ID = newserialno + (Convert.ToInt32(row.RowIndex + 1)).ToString();
                    textbox1.Attributes.Add("runat", "server");
                   
                   // textbox1.AutoPostBack = true;
                    row.Cells[3].Controls.Add(textbox1);
                    //label4
                    Label label4 = new Label();
                    label4.ID = newserialno + (Convert.ToInt32(row.RowIndex + 1)).ToString();
                   
                    label4.Attributes.Add("runat", "server");
                    label4.CssClass = "color";
                   
                    row.Cells[4].Controls.Add(label4);
                }
        }

here i created 3 labels and 1 textbox for each row in gridview. i need to add those textbox values...
so how do i get values in textboxes please tell me...

thank you...