c# - Null DataSet when using SqlDataAdapter.Update method -


i'm attempting update values in database editing them in datagridview (windows form). however, when calling sqldataadapter.update() in code below, it's saying dataset null. i've searched online , found adding acceptchanges() after getchanges() has worked people, has not fixed error.

below code trying use, appreciated.

private void datagridview1_cellendedit(object sender, datagridviewcelleventargs e)     {         carhiredatasetbindingsource.endedit();          string connectionstring = "data source=sqlserver;initial catalog=carhire;integrated security=true";         string selectcommand = "select * carhire.dbo.customer";          sqlconnection con = new sqlconnection(connectionstring);         con.open();          dataset ds = carhiredataset.getchanges();         carhiredataset.acceptchanges();         dataadapter da = new sqldataadapter(selectcommand, connectionstring);         da.update(ds);          con.close();     }

edit: tried this, still same error.

private void datagridview1_cellendedit(object sender, datagridviewcelleventargs e)     {         carhiredatasetbindingsource.endedit();          string connectionstring = "data source=sqlserver;initial catalog=carhire;integrated security=true";         string selectcommand = "select * carhire.dbo.customer";          sqlconnection con = new sqlconnection(connectionstring);         con.open();          datatable dt = carhiredataset.tables["customer"].getchanges();         dataset ds = new dataset();         ds.tables.add(dt);         ds.acceptchanges();         dataadapter da = new sqldataadapter(selectcommand, connectionstring);         da.update(ds);          con.close();     }

i think better execute update when user finishes editing row.

move code cellendedit event rowvalidated event.

private void datagridview1_rowvalidated(object sender, datagridviewcelleventargs e) {     //here place code update }

Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more