how to create dynami controls on button click ?

Question

hello I created a form with 3 textbox and I want to add another dynamic text box when the user click the button; Everything working fine but when I try to read the data using FindControl it doesnt find anything. If I create the dynamic buttons on Page_Init its find them but if I create then on the button click event it wont find them using FindControl. what can I do ?

Vulpes · Answer

I see what you mean. It appears that the ViewState variable is not refreshed until AFTER the page has loaded. I'm cheating a bit but this is working OK for me without the need to click the MoreBtn twice: protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { ViewState[num] = 1; // start at 1 rather than 0 Panel1.Style[Position] = Relative; } else { int num = int.Parse(ViewState[num].ToString()); if (num > 0) { generateDynamicControls(num); } } } protected void MoreBtn_Click(object sender EventArgs e) { int num = int.Parse(ViewState[num].ToString()); num++; // this won't take effect until the postback after next ViewState[num] = num.ToString(); } protected void generateDynamicControls(int num) { for (int i = 1; i { TextBox newtxt = new TextBox(); newtxt.Style[Position] = Absolute; newtxt.Style[Top] = ((i -1) * 25).ToString() + px; newtxt.Style[Left] = 10px; newtxt.ID = newtxt + i; newtxt.Text = newtxt.ID; Panel1.Controls.Add(newtxt); } }

Vulpes · Answer

Dynamically created controls don't persist on a post-back which is why you can't find them. You can't therefore create them on a button click. You either need to create them in Page_Init or each time the page loads in Page_Load.

gavriel ankri · Answer

wow! you did it! Great. you are the best

gavriel ankri · Answer

void Page_Load(object sender EventArgs e) { if (int.Parse(ViewState[num].ToString()) > 0) { generateDynamicControls(); } } void MoreBtn_Click(object sender EventArgs e) { num = int.Parse(ViewState[num].ToString()); num += 1; ViewState[num] = num.ToString(); } void generateDynamicControls() { TextBox newtxt = new TextBox(); newtxt.ID = newtxt + num; panel2.Controls.Add(newtxt); }

Vulpes · Answer

Can you post the code as you now have it please.

gavriel ankri · Answer

thank you but if I create them on page_load its only fire on the second click but not in the first click. do you know how can it work on the first click ?

gavriel ankri · Answer

void MoreBtn_Click(object sender EventArgs e) { for (int i = guestList.Count; i { TextBox newtxt = new TextBox(); newtxt.ID = lbName + i; panel2.controls.add (newtxt); } this work fine but when i try to read the data: el0.SetAttribute(fullName ((TextBox)FindControl(lbName + i)).Text; I get an error that it cant find the specific textbox

Abhay Shanker · Answer

can you please share the code and point where you are getting error