using System; using System.Collections; using System.Configuration; using System.Data; 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; public partial class Default16 : 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++; } } } } protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { SetInitialRow(); } } protected void ButtonAdd_Click(object sender, EventArgs e) { AddNewRowToGrid(); } }
var
This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)