asp.net GridView dynamic line creation with dropmenu as Textbox entry

Question

I have found a dynamic gridview code that creates lines and saves the one you filled last.

In my code i want to parse the droplist selected value text instead of actually writing in the textbox.

I have managed to parse the selectedvalue text in a textbox and for one line everything goes fine, but when i try to create a second line the selected value becomes the same for both lines. (example: lets say i have a ddl menu with the values "a,b" if i choose the a value first the textbox will be filled ok "a" value, but if i choose b for the second line it will be both "b".

I will be needing 9 textboxes but i have made a simple version of the code containing only 1 textbox for the sake of space.

HTML

 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication4.WebForm1" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div style="height: 337px"> <asp:GridView ID="Gridview1" runat="server" ShowFooter="true" AutoGenerateColumns="false" OnSelectedIndexChanged="Gridview1_SelectedIndexChanged"> <Columns> <asp:BoundField DataField="RowNumber" HeaderText="Row Number" /> <asp:TemplateField HeaderText="Header 1"> <ItemTemplate> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> </ItemTemplate> </asp:TemplateField> <asp:TemplateField > <FooterStyle HorizontalAlign="Right" /> <FooterTemplate> <asp:Button ID="ButtonAdd" runat="server" Text="Add New Row" OnClick="ButtonAdd_Click" /> </FooterTemplate> </asp:TemplateField> </Columns> </asp:GridView> <br /> <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> </asp:DropDownList> <br /> <br /> <br /> </div> </form> </body> </html>

C# code

namespace WebApplication4
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        if (!Page.IsPostBack)
        {
            setInitialRow();
        }
    }




    protected void Gridview1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }





    protected void ButtonAdd_Click(object sender, EventArgs e)
    {
        AddNewRowToGrid();
    }





    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)));


        dr = dt.NewRow();
        dr["RowNumber"] = 1;
        dr["Column1"] = string.Empty;

        dt.Rows.Add(dr);


        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++)
                {

                    TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");


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


                    dtCurrentTable.Rows[i - 1]["Column1"] = box1.Text;



                    rowIndex++;

                }

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

                Gridview1.DataSource = dtCurrentTable;
                Gridview1.DataBind();

            }
            else
            {
                Response.Write("Viewstate is null");
            }
            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");


                    box1.Text = dt.Rows[i]["Column1"].ToString();

                    rowIndex++;
                }
            }
        }
    }



    protected void DropDownList1_SelectedIndexChanged(object sender,   EventArgs e)
    {

    }
}

}

So as you'd imagine i tried going

 box1.Text = DropDownList1.SelectedValue.ToString();

I tried with view state, but generally i failed. Thanks for any of the answers guys!

Answer 1

ASPX Page

 <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="true">
    </asp:DropDownList>

Code Behind

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        SetPreviousData();
        if (ViewState["CurrentTable"] != null)
        {

            DataTable dt = (DataTable)ViewState["CurrentTable"];

            if (dt.Rows.Count > 0)
            {
                TextBox box1 = (TextBox)Gridview1.Rows[(dt.Rows.Count - 1)].Cells[1].FindControl("TextBox1");
                box1.Text = DropDownList1.SelectedValue;
            }
        }
    }

Another Approach you can try is you can directly place dropdownlist in gridview instead of textbox.

asp.net GridView dynamic line creation with dropmenu as Textbox entry

Question

1 answers

solution1
0 ACCPTED 2016-01-15 12:54:42

asp.net GridView dynamic line creation with dropmenu as Textbox entry

Question

1 answers

solution1 0 ACCPTED 2016-01-15 12:54:42

solution1
0 ACCPTED 2016-01-15 12:54:42