c# - Problems with if (!IsPostBack) in gridview -
i have gridview , columns editable text fields , column button in template field command name(ed).
i have issue postbacks because when type next text textboxes need able click save button , save new data gridview , in order need if (!ispostback) in page load around populategridview stop overwriting changed data.
this work fine when clicking button not hit command name , button disappears instead of doing anything. if remove if (!ispostback) button works fine can't newly entered text data.
here of code:
protected void page_load(object sender, eventargs e) { getuserinfo(); constpageid = convert.toint16(request.querystring["pageid"]); if (!ispostback) { populategridview(); } } private void populategridview() { try { using (sqlconnection conn = new sqlconnection(getconnection.getconnectionstring())) { sqlcommand sqlcomm = new sqlcommand("pl_usercolumns_get", conn); sqlcomm.parameters.addwithvalue("@pageid", constpageid); sqlcomm.parameters.addwithvalue("@userid", struserid); sqlcomm.commandtype = commandtype.storedprocedure; sqldataadapter da = new sqldataadapter(); da.selectcommand = sqlcomm; da.fill(ds); if (ds.tables[0].rows.count != 0) { gvorder.datasource = ds.tables[0]; gvorder.databind(); } } } catch (sqlexception ex) { exceptionhandling.sqlexception(ex, constpageid, constissitespecific); } } protected void gvorder_rowcommand(object sender, gridviewcommandeventargs e) { if (e.commandname == "ed") { gridviewrow gvr = (gridviewrow)((control)e.commandsource).namingcontainer; int rowindex = gvr.rowindex; label id = gvr.findcontrol("lblid") label; string id = id.text; try { sqlconnection dbconnection = new sqlconnection(); dbconnection.connectionstring = getconnection.getconnectionstring(); sqlcommand dbcommand = new sqlcommand("pl_usercolumns_ed", dbconnection); dbcommand.commandtype = commandtype.storedprocedure; dbcommand.parameters.add("@pageid", sqldbtype.int).value = convert.toint16(constpageid); dbcommand.parameters.add("@userid", sqldbtype.int).value = convert.toint16(struserid); dbcommand.parameters.add("@columnid", sqldbtype.int).value = convert.toint16(id); dbconnection.open(); dbcommand.executenonquery(); dbconnection.close(); } catch (sqlexception ex) { exceptionhandling.sqlexception(ex, constpageid, constissitespecific); } response.redirect("modifycolumns.aspx?&pageid=" + constpageid); } } } row databound:
protected void gvorder_rowdatabound(object sender, gridviewroweventargs e) { datatable dt = ds.tables[0]; dropdownlist ddl = new dropdownlist(); textbox txt = new textbox(); int index = 1; int indexenabled = 1; if (e.row.rowtype == datacontrolrowtype.datarow) { ddl = e.row.findcontrol("ddlnewo") dropdownlist; txt = e.row.findcontrol("txtnewt") textbox; } if (e.row.rowindex == 0) { ddl.items.add("1"); ddl.enabled = false; txt.enabled = false; } else if (e.row.rowindex != 0) { ddl.items.remove("1"); //create ed button if (e.row.rowtype == datacontrolrowtype.datarow) { button btned = new button(); btned.id = "btned"; btned.cssclass = "buttonsmall"; btned.commandname = "ed"; btned.enableviewstate = true; datarow r = dt.rows[e.row.rowindex]; if (r.itemarray[3].tostring() == "1") { btned.text = "disable"; e.row.cssclass = "rowenabled"; foreach (datarow r2 in dt.rows) { if (r2.itemarray[3].tostring() == "1") { string listitem = convert.tostring(indexenabled+1); ddl.items.add(listitem); indexenabled++; } } int itemtoremove = ddl.items.count+1; ddl.items.remove(itemtoremove.tostring()); ddl.selectedindex = idxselected; idxselected++; } else if (r.itemarray[3].tostring() == "0") { btned.text = "enable"; e.row.cssclass = "rowdisabled"; ddl.enabled = false; txt.enabled = false; foreach (datarow r1 in dt.rows) { string listitem = convert.tostring(index); ddl.items.add(listitem); index++; } ddl.selectedindex = e.row.rowindex; } //add button grid e.row.cells[6].controls.add(btned); } } } protected void btned_click(object sender, eventargs e) { // coding click event } protected void getuserinfo() { try { if (userinfo == null) { //sorry...no cookie! } else { if (!string.isnullorempty(userinfo.values["userid"])) { struserid = userinfo.values["userid"]; } } } catch (exception ex) { exceptionhandling.netexception(ex, constpageid, constissitespecific); } } aspx:
<body> <form id="form1" runat="server"> <div> <asp:gridview id="gvorder" runat="server" width="100%" cssclass="tblbrowse" autogeneratecolumns="false" onrowdatabound="gvorder_rowdatabound" onrowcommand="gvorder_rowcommand"> <columns> <asp:boundfield datafield="currento" headertext="curr. order" /> <asp:templatefield headertext="new order"> <itemtemplate> <asp:dropdownlist id="ddlnewo" runat="server" width="99%"></asp:dropdownlist> </itemtemplate> </asp:templatefield> <asp:boundfield datafield="currentt" headertext="curr. text" /> <asp:templatefield headertext="new text"> <itemtemplate> <asp:textbox runat="server" width="98%" id="txtnewt" text='<%# bind("currentt") %>'></asp:textbox> </itemtemplate> </asp:templatefield> <asp:templatefield visible="false"> <itemtemplate> <asp:label id="lblid" runat="server" text='<%# bind("id") %>'></asp:label> </itemtemplate> </asp:templatefield> <asp:templatefield visible="false"> <itemtemplate> <asp:label id="lbled" runat="server" text='<%# bind("enabled") %>'></asp:label> </itemtemplate> </asp:templatefield> <asp:templatefield headertext="enable/disable"></asp:templatefield> </columns> </asp:gridview> </div> <asp:button id="btnsave" runat="server" cssclass="smallbutton" onclick="btnsave_click" text="save" width="100px" onclientclick="close(); return true;" /> <br /> <asp:label id="lblmessage" runat="server" forecolor="red" visible="false"></asp:label> </form> </body>
the issue here trying add button dynamically every time have construct column separately. since using gvorder_rowdatabound(object sender, gridviewroweventargs e) method not called in post not doing gvorder databinding in post back, buttons missed added under rowdatabound event.
try below code , check if working fine:
page_load method:
protected void page_load(object sender, eventargs e) { getuserinfo(); constpageid = convert.toint16(request.querystring["pageid"]); if (!ispostback) { populategridview(); } contructcolumn(); } row data bound method:
protected void gvorder_rowdatabound(object sender, gridviewroweventargs e) { contructcolumn(); } construct column method (newly added method):
private void contructcolumn() { datatable dt = ds.tables[0]; dropdownlist ddl = new dropdownlist(); textbox txt = new textbox(); int index = 1; int indexenabled = 1; foreach (gridviewrow row in gvorder.rows) { if (row.rowtype == datacontrolrowtype.datarow) { ddl = row.findcontrol("ddlnewo") dropdownlist; txt = row.findcontrol("txtnewt") textbox; } if (row.rowindex == 0) { ddl.items.add("1"); ddl.enabled = false; txt.enabled = false; } else if (row.rowindex != 0) { ddl.items.remove("1"); //create ed button if (row.rowtype == datacontrolrowtype.datarow) { button btned = new button(); btned.id = "btned"+row.rowindex; btned.cssclass = "buttonsmall"; btned.commandname = "ed"; btned.enableviewstate = true; datarow r = dt.rows[row.rowindex]; if (r.itemarray[3].tostring() == "1") { btned.text = "disable"; row.cssclass = "rowenabled"; foreach (datarow r2 in dt.rows) { if (r2.itemarray[3].tostring() == "1") { string listitem = convert.tostring(indexenabled + 1); ddl.items.add(listitem); indexenabled++; } } int itemtoremove = ddl.items.count + 1; ddl.items.remove(itemtoremove.tostring()); ddl.selectedindex = idxselected; idxselected++; } else if (r.itemarray[3].tostring() == "0") { btned.text = "enable"; row.cssclass = "rowdisabled"; ddl.enabled = false; txt.enabled = false; foreach (datarow r1 in dt.rows) { string listitem = convert.tostring(index); ddl.items.add(listitem); index++; } ddl.selectedindex = row.rowindex; } //add button grid row.cells[6].controls.add(btned); } } } }
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