how to get value of dynamic created textbox in itemtemplate of Gridview

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C#

ASP.NET

C#4.0

hi..

i have a gridview. i created two item TemplateField in gridview.

other two or more columns are added in gridview Dynamically using TemplateField of textbox.

<asp:GridView ID="grdProductFields" runat="server" AllowPaging="false"
            AutoGenerateColumns="false" Width="100%" CssClass="mGrid" PageSize="50"
            AlternatingRowStyle-CssClass="alt" PagerStyle-CssClass="pgr"
            onrowdatabound="grdProductFields_RowDataBound"
            onrowcommand="grdProductFields_RowCommand" >
            <PagerSettings  Mode="NumericFirstLast" PageButtonCount="5"  FirstPageText="First" LastPageText="Last"/>
            <Columns>
                <asp:TemplateField HeaderText="S. No." HeaderStyle-Width="40" ItemStyle-HorizontalAlign="Center">
                    <ItemTemplate>
                        <asp:Label ID="lblSNo" runat="server" Text='<%# ((int)DataBinder.Eval(Container, "RowIndex"))+1 %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Order No." HeaderStyle-Width="100">
                    <ItemTemplate>
                        
                        <asp:TextBox ID="txtSerialno" runat="server" class="textbox" style="width:90px; vertical-align:top; margin-bottom:5px;"></asp:TextBox>
                        
                    </ItemTemplate>
                </asp:TemplateField>

                
            </Columns>
        </asp:GridView>

i am adding dynamic column with textbox using follwing code :

//Iterate through the columns of the datatable to set the data bound field dynamically.
            foreach (DataColumn col in dtTemp.Columns)
            {
                //Declare the bound field and allocate memory for the bound field.
                TemplateField bfield = new TemplateField();

                //Initalize the DataField value.
                bfield.HeaderTemplate = new GridViewTemplate(ListItemType.Header, col.ColumnName);

                //Initialize the HeaderText field value.
                bfield.ItemTemplate = new GridViewTemplate(ListItemType.Item, GridViewTemplate.ItemType.Textbox, col.ColumnName);

                //Add the newly created bound field to the GridView.
                grdProductFields.Columns.Add(bfield);
            }



            //Initialize the DataSource
            grdProductFields.DataSource = dt;
            //Bind the datatable with the GridView.
            grdProductFields.DataBind();

using GridViewTemplate class for create template field.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;


//A customized class for displaying the Template Column
public class GridViewTemplate : ITemplate
{
    //A variable to hold the type of ListItemType.
    ListItemType _templateType;

   
    //A variable to hold the column name.
    string _columnName;


    public GridViewTemplate(ListItemType type, string colname)
    {
        //Stores the template type.
        _templateType = type;


        //Stores the column name.
        _columnName = colname;
    }

    //Constructor where we define the template type and column name.
    public GridViewTemplate(ListItemType type, ItemType itemtype , string colname)
    {
        //Stores the template type.
        _templateType = type;

        //Stores the column name.
        _columnName = colname;
    }

    void ITemplate.InstantiateIn(System.Web.UI.Control container)
    {
        switch (_templateType)
        {
            case ListItemType.Header:
                //Creates a new label control and add it to the container.
                Label lbl = new Label();            //Allocates the new label object.
                lbl.Text = _columnName;             //Assigns the name of the column in the lable.
                container.Controls.Add(lbl);        //Adds the newly created label control to the container.
                break;

            case ListItemType.Item:
                //Creates a new text box control and add it to the container.
                        TextBox txt = new TextBox();                            //Allocates the new text box object.
                        txt.DataBinding += new EventHandler(txt_DataBinding);   //Attaches the data binding event.
                        txt.Width = 90;
                        txt.CssClass = "textbox";
                        container.Controls.Add(txt);                            //Adds the newly created textbox to the container.
                break;
            case ListItemType.EditItem:
                //As, I am not using any EditItem, I didnot added any code here.
                break;

            case ListItemType.Footer:
                CheckBox chkColumn = new CheckBox();
                chkColumn.ID = "Chk" + _columnName;
                container.Controls.Add(chkColumn);
                break;
        }
    }
}

on button click.., how to get the each textbox value to store in database..

i try some code but, this give error..

this code not recognize dynamically added columns in code behind..
normally cell index 0 or 1 are accessible this code but when we going to access next cell who is added dynamically give error.

foreach (GridViewRow grdrow in grdProductFields.Rows)
        {
            TextBox txt1 = null;
            foreach (Control c in grdrow.Cells[2].Controls)
            {
                if (c != null)
                {
                    if (c.GetType() == typeof(TextBox))
                    {
                        txt1 = (TextBox)c;


                        string str = txt1.Text;
                    }

                    string strtype = c.GetType().ToString();
                }
            }

        }

please give me solution..