Dear Sir,

How to make dynamically multiple textbox with add button and save value in table using asp c#.

Please help me to complete my new task. Please sir.

I have no any idea how to do this.

namespace mtrlgtps
{
    public partial class crtgtp : System.Web.UI.Page
    {       
        private void SetInitialRow()
        {
            DataTable dt = new DataTable();
            DataRow dr = null;
            dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
            dt.Columns.Add(new DataColumn("Column1", typeof(string)));
            dt.Columns.Add(new DataColumn("Column2", typeof(string)));
            dt.Columns.Add(new DataColumn("Column3", typeof(string)));
            dr = dt.NewRow();
            dr["RowNumber"] = 1;
            dr["Column1"] = string.Empty;
            dr["Column2"] = string.Empty;
            dr["Column3"] = string.Empty;
            dt.Rows.Add(dr);

            //Store the DataTable in ViewState
            ViewState["CurrentTable"] = dt;

            Gridview1.DataSource = dt;
            Gridview1.DataBind();
        }
        private void AddNewRowToGrid()
        {
            int rowIndex = 0;

            if (ViewState["CurrentTable"] != null)
            {
                DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
                DataRow drCurrentRow = null;
                if (dtCurrentTable.Rows.Count > 0)
                {
                    for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                    {
                        //extract the TextBox values
                        TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                        TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                        TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");

                        drCurrentRow = dtCurrentTable.NewRow();
                        drCurrentRow["RowNumber"] = i + 1;

                        dtCurrentTable.Rows[i - 1]["Column1"] = box1.Text;
                        dtCurrentTable.Rows[i - 1]["Column2"] = box2.Text;
                        dtCurrentTable.Rows[i - 1]["Column3"] = box3.Text;

                        rowIndex++;
                    }
                    dtCurrentTable.Rows.Add(drCurrentRow);
                    ViewState["CurrentTable"] = dtCurrentTable;

                    Gridview1.DataSource = dtCurrentTable;
                    Gridview1.DataBind();
                }
            }
            else
            {
                Response.Write("ViewState is null");
            }

            //Set Previous Data on Postbacks
            SetPreviousData();
        }
        private void SetPreviousData()
        {
            int rowIndex = 0;
            if (ViewState["CurrentTable"] != null)
            {
                DataTable dt = (DataTable)ViewState["CurrentTable"];
                if (dt.Rows.Count > 0)
                {
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                        TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                        TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");

                        box1.Text = dt.Rows[i]["Column1"].ToString();
                        box2.Text = dt.Rows[i]["Column2"].ToString();
                        box3.Text = dt.Rows[i]["Column3"].ToString();

                        rowIndex++;
                    }
                }
            }
        }
        string cs = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        SqlConnection con;
        SqlDataAdapter adapt;
        DataTable dt;

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                SetInitialRow();
            }

            Label4.Text = DateTime.Now.ToString("dd-MMM-yyyy hh:mm:ss tt");
            if (!this.IsPostBack)
            {
                //this.BindGrid();
                if (Session["emp_nm"] == null)
                    Response.Redirect("nlgn.aspx");
                else
                {

                    String EmplooyeId = Session["emp_id"].ToString();
                    lblnm.Text = " " + EmplooyeId + "";
                    String emp_nm = Session["emp_nm"].ToString();
                    Label2.Text = "" + emp_nm + " ";
                    String dept = Session["dept"].ToString();
                    Label3.Text = "" + dept + " ";
                    String dept_code = Session["dept_code"].ToString();
                    Label5.Text = "" + dept_code + " ";
                }
            }
            if (!this.IsPostBack)
            {
                string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
                using (SqlConnection con = new SqlConnection(constr))
                {
                    using (SqlCommand cmd = new SqlCommand("SELECT emp_num, emp_name FROM emp_mast"))
                    {
                        cmd.CommandType = CommandType.Text;
                        cmd.Connection = con;
                        con.Open();
                        ddlCustomers.DataSource = cmd.ExecuteReader();
                        ddlCustomers.DataTextField = "emp_name";
                        ddlCustomers.DataValueField = "emp_num";
                        ddlCustomers.DataBind();
                        con.Close();
                    }
                }

                ddlCustomers.Items.Insert(0, new ListItem("--Select Employee--", "0"));
            }

            string constr1 = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr1))
            {
                using (SqlCommand cmd = new SqlCommand("SELECT vndr_id, vndr_nm FROM vndr"))
                {
                    cmd.CommandType = CommandType.Text;
                    cmd.Connection = con;
                    con.Open();
                    ddlvndr.DataSource = cmd.ExecuteReader();
                    ddlvndr.DataTextField = "vndr_nm";
                    ddlvndr.DataValueField = "vndr_id";
                    ddlvndr.DataBind();
                    con.Close();
                }
            }
            ddlvndr.Items.Insert(0, new ListItem("--Select Employee--", "0"));
        }
    }
}