I would like to add minute (which is entered from a calcEdit) to starting date then it wil be set as end date.
Also when I enter the end date the subtract of start time will be set as minute .
I tried dateEdit's EditValueChanged ,Validating events and I tried both for calcedit but got wrong values.
I use g mask for dateEdits
Please help me thank you.
Here are my codes :
`private void calcEditMinute_Validating(object sender, CancelEventArgs e)
{
try
{
dtBitisZamani = Convert.ToDateTime(dateEditBas.EditValue).AddMinutes(Convert.ToDouble(calcEditMinute.Text));
dateEditBit.EditValue = dtBitisZamani;
}
catch (Exception)
{
}
}
private void dateEditBit_EditValueChanged(object sender, EventArgs e)
{
TimeSpan span = Convert.ToDateTime(dateEditBit.EditValue).Subtract(Convert.ToDateTime(dateEditBas.EditValue));
calcEditMinute.Text = string.Format(" {0} ",
span.Minutes); span.TotalMinutes.ToString();
}`
Try this:
private void calcEdit1_EditValueChanged(object sender, EventArgs e)
{
dateEditEnd.DateTime = dateEditStart.DateTime.AddMinutes(Convert.ToDouble(calcEdit1.Value));
}
private void dateEditEnd_EditValueChanged(object sender, EventArgs e)
{
dateEditStart.DateTime = dateEditEnd.DateTime.AddMinutes(Convert.ToDouble(calcEdit1.Value) * -1);
}
Related
I want to increment date in every click ASP.NET.
But Every time the page posts back, it is essentially starting over from scratch - anything initialized to 0.
I need to persist a value across postbacks but I don't how to do that. I would appreciate for any help.
Here is what I'am trying to do:
int myNumber = 0;
protected void Button1_Click1(object sender, EventArgs e)
{
lblDate.Text = DateTime.Now.StartOfWeek(DayOfWeek.Monday).AddDays(myNumber).ToShortDateString();
myNumber++;
}
Update:
My finaly goal is to get next weeks first day with next button and Previous week, I mean I want to forword and backword...
public int NextCount
{
get { return ViewState["Count"] != null ? (int)ViewState["Count"] : 7; }
set { ViewState["Count"] = value; }
}
protected void btnNext_Click1(object sender, EventArgs e)
{
lblsum.Text = DateTime.Now.StartOfWeek(DayOfWeek.Monday).AddDays(NextCount).ToShortDateString();
NextCount = NextCount+7;
}
protected void btnPrevious_Click(object sender, EventArgs e)
{
lblsum.Text = DateTime.Now.StartOfWeek(DayOfWeek.Monday).AddDays(NextCount).ToShortDateString();
NextCount = NextCount - 7;
}
But When I click Prev button .. there is delay with one click after two or three Click then reaction coming the same with next button when you click from prev to next. Maybe I have to store it in session?
I have updated your code below by using ViewState to handle this. Other easiest option would be storing the same in Session, Cache or Cookie.
While storing a value in ViewState, it will create a hidden field
in the page and store the value to maintain it across the postback.
public int NextCount
{
get { return ViewState["NextCount"] != null ? (int)ViewState["NextCount"] : 0; }
set { ViewState["NextCount"] = value; }
}
protected void btnNext_Click1(object sender, EventArgs e)
{
NextCount = NextCount+7;
lblsum.Text = DateTime.Now.StartOfWeek(DayOfWeek.Monday).AddDays(NextCount).ToShortDateString();
}
protected void btnPrevious_Click(object sender, EventArgs e)
{
NextCount = NextCount - 7;
lblsum.Text = DateTime.Now.StartOfWeek(DayOfWeek.Monday).AddDays(NextCount).ToShortDateString();
}
I am trying to send the data to serial port in ASP.net. After connecting to serial port Before postback data is being sent. But after postback i get exception while sending data.
'System.InvalidOperationException: The port is closed.'
I tried everything by connecting to port on pageload: ispostback, and disconnecting and connecting again. Still it shows same exception. Is there any way to retain the state of serial port..
here's my code. Please Help me Out...
public partial class _Default : System.Web.UI.Page
{
string indata;
public SerialPort sp = new SerialPort();
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
openPort("COM10");
disconnect();
connect();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
//disconnect();
openPort("COM10");
connect();
check(TextBox1.Text); //Data Sending Successful but after postback even it doesnt work too.
}
public void connect()
{
try { sp.Open(); }
catch (Exception e1) { MessageBox.Show(e1.ToString()); }
}
public void disconnect()
{
try { sp.Close(); }
catch (Exception e1) { MessageBox.Show(e1.ToString()); }
}
public void openPort(string p)
{
sp.BaudRate = 9600;
sp.Parity = Parity.None;
sp.StopBits = StopBits.One;
sp.DataBits = 8;
sp.Handshake = Handshake.None;
sp.PortName = p;
sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
// sp.ReadTimeout = 200;
// sp.WriteTimeout = 200;
}
private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
indata = sp.ReadExisting();
Debug.WriteLine(" Data Received:");
Debug.Write(" " + indata);
}
protected void Button4_Click(object sender, EventArgs e)
{
check("" + (char)26); //Exception in sending
}
protected void Button3_Click(object sender, EventArgs e)
{
check("\r\n"); //exception in sending
}
protected void Button2_Click(object sender, EventArgs e)
{
check(TextBox1.Text); // exception in sending
}
void check(string ss)
{
//sp.Dispose();
//openPort("COM10"); connect();
if (sp.IsOpen)
sp.Write(ss);
else
{
disconnect(); openPort("COM10"); connect();
sp.Write(ss);
}
}
}
I would simplify your code, so the port is configured on page load and the one handler deals with resetting your port. The disconnect, connect, I see is complicating it. Here I have given an example of using the button click event.
Please note the missing brace below.
public partial class _Default : System.Web.UI.Page
{
string indata;
public SerialPort sp = new SerialPort();
protected void Page_Load(object sender, EventArgs e)
{
sp.BaudRate = 9600;
sp.Parity = Parity.None;
sp.StopBits = StopBits.One;
sp.DataBits = 8;
sp.Handshake = Handshake.None;
sp.PortName = p;
sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
// sp.ReadTimeout = 200;
// sp.WriteTimeout = 200;
}
if (!Page.IsPostBack)
{
sp.BaudRate = 9600;
sp.Parity = Parity.None;
sp.StopBits = StopBits.One;
sp.DataBits = 8;
sp.Handshake = Handshake.None;
sp.PortName = p;
sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
// sp.ReadTimeout = 200;
// sp.WriteTimeout = 200;
}
protected void Button1_Click(object sender, EventArgs e)
if sp.IsOpen = False then
{
try { sp.Open(); }
catch (Exception e1) { MessageBox.Show(e1.ToString()); }
}
else
{
try { sp.Close(); }
catch (Exception e1) { MessageBox.Show(e1.ToString()); }
}
void check(string ss)
{
//sp.Dispose();
//openPort("COM10"); connect();
if (sp.IsOpen)
{//missing brace
sp.Write(ss);
}//missing brace
else
{
sp.Open();
sp.Write(ss);
}
}
}
Edit 2:
As I mentioned in the comments the code will only run once.
The following examples are provided from the link below.
Have you tried writing some codes under the !IsPostBack code block to
check if the codes hits there when it postbacks? try this below for
testing
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Response.Write("First load");
}
else
{
Response.Write("Postback occurs");
}
}
OR
I will refer the code you want to run as One Time Code. For what you
are attempting to achieve, following should work. Please note that
sessions also expire. So after about 20 minutes (default value) of
inactivity, if the user comes back to the site/hits refresh, the One
Time Code will run again. If you want something more persistent than
20 minutes you can try using cookies, but if user clears their cookies
your One Time Code with run again.
protected void Page_Load(object sender, EventArgs e)
{
if (Session["firsttimeuser"] == null)
{
//put code here for One Time Code;
Session["firsttimeuser"] = true;
}
}
Please see this link:
There is lengthy discussion about this.
http://forums.asp.net/t/1314918.aspx/1
You should be able to create a solution from this, please advise.
Edit 1
Please see MSDN for Get Port Names:
Use the GetPortNames method to query the current computer for a list
of valid serial port names. For example, you can use this method to
determine whether COM1 and COM2 are valid serial ports for the current
computer.
http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.getportnames.aspx
And SerialPort.Open
_serialPort.PortName = SetPortName(_serialPort.PortName)
http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.open.aspx
Edit 3
Try:
if (!IsPostBack) or
if(!Page.IsPostBack)
Please see:
Implementation of IsPostBack in page load
What is a postback?
and:
http://msdn.microsoft.com/en-us/library/ms178472.aspx
Can anyone tell me what I'm doing wrong?
//--- menuFac ---
public void UpdatePageById()
{
db.ModifyData("UPDATE tblsider SET colOverskrift=#1, colTekst=#2 WHERE colID=#3", _overskrift, _tekst, _id);
}
//--- where i'm trying to get some from db to edit and save the edited ---
menuFac objTekst = new menuFac();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
objTekst._id = int.Parse(Request.QueryString["colID"]);
DataRow value = objTekst.GetPageById();
txtOverskrift.Text = value["colOverskrift"].ToString();
txtTekst.Text = value["colTekst"].ToString();
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
objTekst._id = int.Parse(Request.QueryString["colID"]);
objTekst._overskrift = txtOverskrift.Text;
objTekst._tekst = txtTekst.Text;
objTekst.UpdatePageById();
Response.Redirect("Protected.aspx");
}
Replace this call method
objTekst.UpdatePageById();
with
this.UpdatePageById();
UpdatePageById is method of your Page Class, not of your property objTekst
Using a GridView on the default page and want to show details of the row selected on another page. The code for capturing and sending the datakey is -
protected void SelectedIndexChanged(object sender, EventArgs e)
{
int index = GridView1.SelectedIndex;
Response.Redirect("InvoicePage.aspx? EntityID= " + GridView1.DataKeys[index].Value.ToString());
}
And the code for retrieving the value is -
protected void Page_Load(object sender, EventArgs e)
{
string id = Request.QueryString["EntityID"];
}
My problem is that the id variable is a null on the receiving page. What am I missing?
Your URL should look something like this: InvoicePage.aspx?EntityID=", No space before or after EntityID
By The way Remove the white space : aspx?<>*EntityID<>*=
protected void SelectedIndexChanged(object sender, EventArgs e)
{
int index = GridView1.SelectedIndex;
string id = GridView1.DataKeys[index].Value.ToString();
Response.Redirect("InvoicePage.aspx?EntityID="+id);
}
Try to add :
private string _EntityId;
//To check if value pass on query string
//but this is not really required if you want
public string EntityId
{
get
{
if (Request.QueryString["EntityID"] != null)
{
try
{
_EntityId = Convert.ToString(Request.QueryString["EntityID"].ToString());
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
else
{
_EntityId="0";
}
return _EntityId;
}
}
protected void Page_Load(object sender, EventArgs e)
{
//Request.QueryString["EntityID"].ToString();
string id = EntityId;
}
Regads
how to do that every time s_Sort not update SortDirection.Desc
private SortDirection s_Sort = SortDirection.Desc;
protected void Page_Load(object sender, EventArgs e)
{
lblSort.Text = S_Sort.ToString();//every time == SortDirection.Desc - this is bad!
if (!IsPostBack)
{
ShowTree();
Validate();
}
}
Need
public void btnSortUp_Click(object sender, EventArgs e)
{
S_Sort = SortDirection.Asc;
}
public void btnSortDown_Click(object sender, EventArgs e)
{
S_Sort = SortDirection.Desc;
}
but after SortDirection.Desc is bad
The is a problem of the ASP.NET lifecycle. Every time a postback happens (for example, when btnSortUp or btnSortDown is clicked), a new instance of your page is created, i.e., S_Sort is reinitialized to Desc. If you want to persist the value between postbacks, you can store it in the viewstate, for example, by encapsulating it in a private property:
private SortDirection S_Sort {
get { return (SortDirection)(ViewState["S_Sort"] ?? SortDirection.Desc); }
set { ViewState["S_Sort"] = value; }
}