I am devleoping a online airline reservation system in which i have two dropdownlists to select source and destinations and a label .this label will show " there are no flights" if there are no matching routes retrieved from the database (in this case its sqlserver 2008).i have written the following code which tries to do so, but when i postback or refresh the page the label with " there are no flights" is till visible.what is wrong with my code please anyone help me with that.
public partial class Dropdndemo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
SqlConnection con=new SqlConnection("Data Source=KUNDAN-PC\\SQLEXPRESS;Initial Catalog=Ars2.1.2;Integrated Security=True");
//string Sqlcmnd="select Source from Ars2.1.2.dbo.Scheduling";
con.Open();
if (!Page.IsPostBack)
{
SqlCommand com = new SqlCommand("select distinct Source from Schedulings", con);
SqlCommand comn=new SqlCommand("select distinct Destination from Schedulings", con);
//SqlDataReader readr;
DropDownList1.DataSource = com.ExecuteReader();
DropDownList1.DataTextField = "Source";
// DropDownList1.DataTextField = "Destination";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, "select Source");
con.Close();
con.Open();
DropDownList2.DataSource = comn.ExecuteReader();
DropDownList2.DataTextField = "Destination";
DropDownList2.DataBind();
DropDownList2.Items.Insert(0, "select Destination");
con.Close();
}
//con.Close();
// DropDownList1.DataBind();
//con.Close();
if (IsPostBack)
Label3.Text = "";
//Label1.Visible = false;
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
// string Source = DropDownList1.SelectedValue.ToString();
// Label1.Text = Source;
}
protected void Button1_Click(object sender, EventArgs e)
{
string src = DropDownList1.SelectedItem.ToString();
string desti = DropDownList2.SelectedItem.ToString();
if ((src == desti) && IsPostBack)
{
Label1.Text = "Source And Destination cant be same!";
}
SqlConnection lop = new SqlConnection("Data Source=KUNDAN-PC\\SQLEXPRESS;Initial Catalog=Ars2.1.2;Integrated Security=True");
lop.Open();
SqlCommand cmd = new SqlCommand("select * from Schedulings where Source=#Source and Destination=#Destination", lop);
cmd.Parameters.AddWithValue("Source", DropDownList1.SelectedItem.Text);
cmd.Parameters.AddWithValue("Destination", DropDownList2.SelectedItem.Text);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count == 0)
{
Label3.Text = "No planes available in this route!!!";
}
}
protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
I suppose you are refreshing page using F5 or by right clicking on page and opting refresh option or using refresh button of browser. If this is the case then I am scared it's not refresh, it's repeating previous action. That means if you were searching for flight and refreshing using above options, it will again search for flight using same search criteria. You can confirm it by putting debugger on search event. You can avoid this behavior by setting and clearing Session or ViewState and manage label text using it.
Related
Thanx in advance.
I'm facing issue in transfering data from gridview of home page to another search reasult page. page showing blank only.no data displaying.
Im using with master page.
Im trying to fetch data from textbox for search result like source and destination from textbox.
for refernce please find below code of home.aspx.cs
protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=IT_APPS_SUPP;Initial Catalog=dotnet;Integrated Security=True; MultipleActiveResultSets=true");
con.Open();
string str1 = "Select * from busbooking where zone='" + txtSourceBus.Text + "' " + "and destination='" + txtDestBus.Text + "'";
SqlCommand cmd1 = new SqlCommand(str1, con);
cmd1.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter(str1, con);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
Label1.Text = "";
SqlDataReader dr = cmd1.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
GridView1.Visible = true;
dr.Close();
}
else
{
GridView1.Visible = true;
Label1.Text = "Data not found";
}
DataTable dt = GridView1.DataSource as DataTable;//set the datasource
Session["GridData"] = dt;
Response.Redirect("~/BusSearch.aspx",true);
}
=========================================================
bussearch.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["GridData"] != null)
{
DataTable dt = (DataTable)Session["GridData"];
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
}
==================================================================
can anyone help for this., my second page showing blank only.
Try passing DataSet instead of DataTable like this
Session["GridData"] = ds.Tables[0];
All the other code can stay as it is.
Hello you can use like this
In bussearch.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["GridData"] != null)
{
DataTable dt = new DataTable();
dt = Session["GridData"] as DataTable;
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
}
I have combobox in my form which display value from database. I want one default value so I use .text property also and on selected index changed event the label display the corresponding value of the database the code is not working
string cstr = ConfigurationManager.ConnectionStrings["Test"].ConnectionString;
private void AddStock_Load(object sender, EventArgs e)
{
bindcombo();
}
private void bindcombo()
{
SqlConnection con = new SqlConnection(cstr);
SqlDataAdapter da = new SqlDataAdapter("SELECT Dname FROM dealer", con);
DataTable dt = new DataTable();
da.Fill(dt);
cmbdealer.DataSource = dt;
cmbdealer.DisplayMember = "Dname";
cmbdealer.Text = "select-Dealer";
con.Close();
}
private void cmbdealer_SelectedIndexChanged(object sender, EventArgs e)
{
dealerdetails();
}
private void dealerdetails()
{
SqlConnection con = new SqlConnection(cstr);
SqlCommand cmd = new SqlCommand("select * from dealer where Dname='" + cmbdealer.Text + "'", con);
con.Open();
SqlDataReader re = cmd.ExecuteReader();
while (re.Read())
{
lbdl.Text = re["Ddlno"].ToString();
lbgst.Text = re["Dgstno"].ToString();
lbadd.Text = re["Daddress"].ToString();
}
}
the above code is working fine but when the form is load all the 3 label shows the database value of the first entry of my dealer table without selecting and value from combobox.
having a problem again... i found a code, but it doesn't work with me... and can't find any related topic here... so then i ask... can anyone do this?
see this link for the image... Please help me do this...
here is our c# code to add and view it on the GridView asp.net
public partial class parypackage : System.Web.UI.Page
{
SqlConnection PartyConnection = new SqlConnection();
DataSet partyDataSet = new DataSet();
SqlDataAdapter partySqlDataAdapter = new SqlDataAdapter();
private string connect;
protected void Page_Load(object sender, EventArgs e)
{
connect = WebConfigurationManager.ConnectionStrings["PartyConnection"].ConnectionString;
PartyConnection = new SqlConnection(connect);
if (!IsPostBack)
{
BindGridview();
}
}
protected void BindGridview()
{
PartyConnection.Open();
SqlCommand cmd = new SqlCommand("select * from package", PartyConnection);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
connect = WebConfigurationManager.ConnectionStrings["PartyConnection"].ConnectionString;
PartyConnection = new SqlConnection(connect);
PartyConnection.Open();
SqlCommand addCommand = new SqlCommand("INSERT package (pkgnumber,pkgitems,pkgamount) values ('" + Convert.ToInt32(TextBox1.Text) + "',#Richtextbox ,'" + Convert.ToDouble(TextBox3.Text) + "')", PartyConnection);
SqlDataReader partySqlDataReader;
addCommand.Parameters.AddWithValue("#Richtextbox", TextBox2.Text);
partySqlDataReader = addCommand.ExecuteReader();
partySqlDataReader.Close();
PartyConnection.Close();
BindGridview();
Response.Redirect("partypackage.aspx");
}
}
No, you cant do this with a multi-line textbox. Although you may try some workarounds but it will be too difficult to have the desired result. A textbox captures the plain text inputted to it. Basically, this is the job of text editor to present the user with styling facilities and capturing the data inputted in form of HTML markup. I strongly recommend to use any free text editor instead of a multiline textbox to achieve this easily.
I want to populate TWO dropdownlist, based on selection of first dropdownlist the second dropdownlist will get populated.
Example :
Like i have two dropdownlist namely 1.ddlCountry and 2.ddlState
Now when country is selected then depending on the selected Country the States related with that Country will get populated in the State dropdownlist. I want to achieve this withour reloading the whole page in Asp.Net with coding language as C#.
How can i achieve the same?
Dropdownlist is fetching data from database by executing query.
You can use AJAX toolkit CascadingDropDown as told by Naresh.
OR
use ajax update panel and keep all Dropdowns in it. So the whole page will not load on changing dropdown value.
You didnt give the code to further solution.
protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
{
FillStateByCountry();
}
protected void ddlState_SelectedIndexChanged(object sender, EventArgs e)
{
FillLocationByCountryandState();
}
private void FillStateByCountry()
{
DataSet dstFillState;
int CountryId = Convert.ToInt32(ddlCountry.SelectedValue.ToString());
dstFillState = Tbl_State.FillDDLState(CountryId);
ddlState.DataSource = dstFillState;
ddlState.DataTextField = "State";
ddlState.DataValueField = "Id";
ddlState.DataBind();
}
similarly FillLocationByCountryandState();
Add two dropdownlists to your form and name it as cmbStates, cmbCities
when you select state name from cmbStates(dropwdownlist), cmbCities(dropdownlist) generates cities based on state name(cmbStates)
by fetching data from database
private void Form1_Load(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("server=pbs-server;database=p2p;user id=shekar;password=sekhar#1346");
SqlCommand cmd = new SqlCommand("select states from Country", con);
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(cmd);
con.Open();
da.Fill(ds, "Country");
cmbStates.DataSource = ds.Tables[0];
cmbStates.SelectedValue = 0;
con.Close();
}
private void cmbStates_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("server=xxxx;database=xxxx;user id=xxxxr;password=xxxxxx");
SqlCommand cmd = new SqlCommand("select cities from States where cityname = 'cmbStates.SelectedItem.ToString()'", con);
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(cmd);
con.Open();
da.Fill(ds, "States");
cmbCities.DataSource = ds.Tables[0];
cmbCities.SelectedValue = 0;
con.Close();
}
OR
manually adding items
namespace DropDownlist
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
cmbStates.Items.Add("Andhra Pradesh");
cmbStates.Items.Add("Tamilnadu");
cmbStates.Items.Add("Karnataka");
cmbStates.SelectedValue = 0;
}
private void cmbStates_SelectedIndexChanged(object sender, EventArgs e)
{
if (cmbStates.SelectedItem.ToString() == "Andhra Pradesh")
{
cmbCities.Items.Clear();
cmbCities.Items.Add("Hyderabad");
cmbCities.Items.Add("Guntur");
cmbCities.Items.Add("Vijayawada");
cmbCities.SelectedValue = 0;
}
else if (cmbStates.SelectedItem.ToString() == "Tamilnadu")
{
cmbCities.Items.Clear();
cmbCities.Items.Add("Chennai");
cmbCities.Items.Add("Coimbatore");
cmbCities.Items.Add("ooty");
cmbCities.SelectedValue = 0;
}
else if (cmbStates.SelectedItem.ToString() == "Karnataka")
{
cmbCities.Items.Clear();
cmbCities.Items.Add("Bangalore");
cmbCities.Items.Add("Mangalore");
cmbCities.SelectedValue = 0;
}
else
{
MessageBox.Show("Please Select any value");
}
}
}
}
I had gridview which in load it will get data from database .And I added option for user to filter this grid view by DDl I did my code and the grid get data when load but when I selected DDl it didnot get any data and I made break point I noticed that Gridview1.Databind() hadnot any action on grid.So please any one help me
protected void Page_Load(object sender, EventArgs e)
{
DataTable DT = new DataTable();
if (DDlCity.SelectedIndex<0)
{
using (SqlConnection con = Connection.GetConnection())
{
SqlCommand Com = new SqlCommand("GetDealers", con);
Com.CommandType = CommandType.StoredProcedure;
SqlDataAdapter DA = new SqlDataAdapter(Com);
DA.Fill(DT);
GridView1.DataSource = DT;
GridView1.DataBind();
}
}
}
protected void DDlCity_SelectedIndexChanged(object sender, EventArgs e)
{
DataTable DT = new DataTable();
using (SqlConnection con = Connection.GetConnection())
{
SqlCommand Com = new SqlCommand("GetDealersByArea", con);
Com.CommandType = CommandType.StoredProcedure;
Com.Parameters.Add(Parameter.NewInt("#DEALERAREA_ID", DDlCity.SelectedValue));
SqlDataAdapter DA = new SqlDataAdapter(Com);
DA.Fill(DT);
GridView1.DataSource = DT;
GridView1.DataBind();
}
}
i suppose you got confused on what i said...no worries
here is a working example of you give example code.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGridFunction();
}
}
private void BindGridFunction()
{
try
{
DataTable DT = new DataTable();
using (SqlConnection con = Connection.GetConnection())
{
if(DDlCity.SelectedIndex <0)
{
SqlCommand Com = new SqlCommand("GetDealers", con);
Com.CommandType = CommandType.StoredProcedure;
}
else
{
SqlCommand Com = new SqlCommand("GetDealersByArea", con);
Com.CommandType = CommandType.StoredProcedure;
Com.Parameters.Add(Parameter.NewInt("#DEALERAREA_ID", DDlCity.SelectedItem.Value));
}
SqlDataAdapter DA = new SqlDataAdapter(Com);
DA.Fill(DT);
GridView1.DataSource = DT;
GridView1.DataBind();
}
}
catch(Exception ex)
{
DT = null; // etc...etc.. clear objects created
}
}
protected void DDlCity_SelectedIndexChanged(object sender, EventArgs e)
{
BindGridFunction();
}
I hope you get what i was trying to say. You can change the code according to you need.
Not tested yet but m sure will work.
Note : i woud suggest to use "DDlCity.SelectedItem.Value" instead of " DDlCity.SelectedValue"
In your post back you can put the binding code in condition
if (!IsPostBack){
// Bind grid here looking for or used call to function something like BindGrid()
}
and in BindGrid() function you can write binding code for grid view.
and on ddl selected index changed event you can again call the BindGrid() method to bind again accordingly.
also check that in your dropdownlist you have EnablePostBack - true.