to generate textboxes dynamically in asp.net

Question

我想动态生成文本框和下拉框作为html表列。像这样我想创建30行。如何在asp.net和c＃.net中做到这一点？我想要在asp.net页面中做到这一点。

Answer 1

 protected void Page_Load(object sender, EventArgs e)
    {
        TextBox txtbx= null;    
        DropDownList ddl = null;

        for (int i = 0; i < 4; i++)
        {               
            txtbx= new TextBox();
            txtbx.ID = "mytxt" + i; 
            txtbx.Text = "mytxt" + i;            

            pnlButton.Controls.Add(txtbx);    

            ddl= new DropDownList();
            ddl.ID = "mydropdown " + j;
            ddl.Text = "mydropdown " + j;
            ddl.Items.Add("Hii");
            ddl.Items.Add("Hello");
            ddl.AutoPostBack = true;
            ddl.SelectedIndexChanged += new EventHandler(ddl_Click);

            pnlButton.Controls.Add(ddl);

            Literal lit = new Literal();
            lit.Text = "</br></br>";
            pnlButton.Controls.Add(lit);
        }
    }

Answer 2

1. On the aspx page use a panel for showing controls in a proper way like this and a button for saving data in

    <asp:Panel ID="pnlQuestions" runat="server" Width="100%"> </asp:Panel> <asp:LinkButton ID="lbtnNext" runat="server" CssClass="button" ToolTip="Next" OnClick="lbtnNext_Click"><span>Save & Next</span></asp:LinkButton> 

2. On the code behind aspx.cs page, you can generate all dynamic controls on Page_Init event

    protected void Page_Init(object sender, EventArgs e) { TextBox txt = new TextBox(); txt.Text = QuestionText; txt.ID = "que1"; pnlQuestions.Controls.Add(txt); } 

3. You can get all dynamic controls value on button click event like this

     protected void lbtnNext_Click(object sender,EventArgs e) { TextBox txt = ((TextBox)pnlQuestions.FindControl("que1")); AnswerText = txt.Text.Trim(); Response.Write(AnswerText); } 

By using this method you can generate and fetch dynamic controls on asp.net page.

for much more understanding : Check this link

Answer 3

To start off you would need something like

<asp:Table ID="mytbl" runat="server">
    </asp:Table>

In the code behind then you can add as

TableRow trow;
TableCell tcell1, tcell2;
for (int i = 0; i < 30; i++)
{
   trow = new TableRow();
   tcell1 = new TableCell();
   tcell1.Controls.Add(new TextBox());
   tcell2 = new TableCell();
   tcell2.Controls.Add(new DropDownList());
   trow.Cells.Add(tcell1);
   trow.Cells.Add(tcell2);
   mytbl.Rows.Add(trow);
}

Add as you require details for ID, Name and dropdown items as you need

Answer 4

protected void Page_Load(object sender, EventArgs e)
{
    TextBox box = new TextBox{ID="textbox1", Text="hello :)"};
    form1.Controls.Add(box);
}