sharepoint - Get value from programmatically created TextBox in C# -

i got itching problem , cant code work

how can read value textbox when form posted?

some code...

protected override void createchildcontrols() {      base.createchildcontrols();      textbox querybox = new textbox();     querybox.id = "querybox";     querybox.tooltip = "enter query here , press submit";     controls.add(querybox);      button querybutton = new button();     querybutton.usesubmitbehavior = false;     querybutton.id = "querybutton";     controls.add(querybutton);      if (page.ispostback == true) {         try {             string query = querybox.text;              datagrid datagrid = new datagrid();             datagrid.datasource = camelot.sharepointconnector.data.helper.executedatatable(query, connectionstring);             datagrid.databind();             controls.add(datagrid);         } catch (exception a) {             controls.add(new literalcontrol(a.message));         } // try     } // if } // void 

i've shortened code bit see idea, string query = querybox.text wont work. i've tried few different variants, i.e.

textbox querybox = (textbox)findcontrol("querybox"); string query = querybox.text; 

but no...

any tips appreciated! thanks

the problem controls not populated values viewstate in createchildcontrols. i'd recommend using click event handler on button.

update button code:

button querybutton = new button(); querybutton.usesubmitbehavior = false; querybutton.id = "querybutton"; querybutton.text = "query"; querybutton.click += new eventhandler(querybutton_click); controls.add(querybutton); 

then, write click event handler:

void querybutton_click(object sender, eventargs e) {     textbox querybox = this.findcontrol("querybox") textbox;     try     {          string query = querybox.text;          datagrid datagrid = new datagrid();          datagrid.datasource = camelot.sharepointconnector.data.helper.executedatatable(query, connectionstring);          datagrid.databind();          controls.add(datagrid);     }     catch (exception a)     {          controls.add(new literalcontrol(a.message));     } // try }