C# - Binding A Dropdownlist To A Database?
Nov 22, 2010
I want to bind a dropdownlist to a database. I did the following coding but it isn't working.
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.Odbc;
using System.Data.SqlClient;....
I am getting the error as
at _Default.rebind() in c:Documents and SettingsaMy DocumentsVisual Studio 2008WebSites oolbar1Default.aspx.cs:line 32
bind the dropdownlist to a datasource.I want my dropdownlist to display text from a database column and use the value field for some other purpose later on in code. I am getting the page displayed when i run the project but not able to get the data in dropdownlist
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protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
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SqlDataAdapter adapSel;
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IXPathNavigable x = (IXPathNavigable)e.Item.DataItem;
XPathNavigator questionNode = x.CreateNavigator();
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//string title = xePage.SelectSingleNode("q").InnerText;
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Panel sliderPanel = (Panel)e.Item.FindControl("pnlSlider");
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{
case "d":
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answerText.Visible = false;
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Response.Write(answersList.ToString());
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//answers.AsQueryable();
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[Code]....
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[Code]....
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I have a State class defined like this:
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i have a textbox1 and drop down list 1
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string:
{"NAAM":["Drenthe","Flevoland","Friesland","Gelderland","Groningen","Limburg","Noord Brabant","Noord Holland","Overijssel","Utrecht","Zeeland","Zuid Holland"],"CODE":["D","X","B","G","A","K","P","L","E","M","S","H"]}
code:
[Code]....
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Jun 11, 2012
i am loading xml file from url and storing data into my database.i am binding that data with my dropdownlist bt the problem is wheneverr i select any option from ddl...by defaulst it takes the always takes first selected index...i.e value at the zeroth index value.....i really don't know what exactly the problem either the problem is with dropdown or the way i am loading xml file and binding it to dropdown.....below is my cs code.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
[code]...
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Oct 22, 2010
I'm trying to bind a List<String> to a DropDownList in a user control. I think I'm doing the right thing, but it seems that after my code executes the bindings are cleared. Here's the code for review!
User control:
<asp:DropDownList ID="subjectNameDropDown" runat="server"/>
<asp:DropDownList ID="yearLevelDropDown" runat="server"/>
Auto-generated designed code-behind:
public partial class NewSiteMetadataUserControl {
protected global::System.Web.UI.WebControls.DropDownList subjectNameDropDown;
protected global::System.Web.UI.WebControls.DropDownList yearLevelDropDown;
}
Code-behind:
public partial class NewSiteMetadataUserControl : UserControl
{
protected override void CreateChildControls()
{
subjectNameDropDown = new DropDownList();
yearLevelDropDown = new DropDownList();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
EnsureChildControls();
// Attempt 1
List<String> subjectNames = GetSubjectValues();
foreach (var subjectName in subjectNames)
subjectNameDropDown.Items.Add(subjectName);
subjectNameDropDown.DataBind();
// Attempt 2
List<String> yearLevels = GetYearLevelValues();
yearLevelDropDown.DataSource = yearLevels;
yearLevelDropDown.DataBind();
}
}
Should this approach work? If it should, how can I debug what happens after the code executes?
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Aug 24, 2010
private void AddDBDataToControl(DataSet app_Support,int count) {
int i = 0; while (count != 0) {
DateTime dt = Convert.ToDateTime(app_Support.Tables[0].Rows[i]["FromDate"].ToString());
//dt=23/08/2010 10:04:00 AM
DropDownList h1 = (DropDownList)GVDate.Rows[i].Cells[1].FindControl("txthour");
h1.SelectedValue = dt.Hour.ToString();
DropDownList m1 = (DropDownList)GVDate.Rows[i].Cells[2].FindControl("txtmin");
m1.SelectedValue = dt.Minute.ToString();
DropDownList h2 = (DropDownList)GVDate.Rows[i].Cells[5].FindControl("txthourto");
DateTime dt2 = Convert.ToDateTime(app_Support.Tables[0].Rows[i]["ToDate"].ToString());
//dt2=28/08/2010 14:25:00 PM
h2.SelectedValue = dt2.Hour.ToString();
DropDownList m2 = (DropDownList)GVDate.Rows[i].Cells[6].FindControl("txtminto");
m2.SelectedValue = dt2.Minute.ToString();
count--; i++; } }
When the function executes
h1.SelectedValue = "10";
and
m1.SelectedValue ="04";
but when it reaches to
count--
h1.SelectedValue takes the value "14"; rather than h1.SelectedValue = "10"; and
h2.SelectedValue = "14";
and
m1.SelectedValue ="25"; rather than m1.SelectedValue ="04"; and
m2.SelectedValue = "25"
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Jan 15, 2011
Am trying to bind data to a dropdown list on pageload based on a condition. Code explains further below.
public partial class AddExhibit : System.Web.UI.Page {
string adminID, caseIDRetrieved;
DataSet caseDataSet = new DataSet();
SqlDataAdapter caseSqlDataAdapter = new SqlDataAdapter();
string strConn = WebConfigurationManager.ConnectionStrings["CMSSQL3ConnectionString1"].ConnectionString;
protected void Page_Load(object sender, EventArgs e) {
adminID = Request.QueryString["adminID"];
caseIDRetrieved = Request.QueryString["caseID"];
if (caseIDRetrieved != null) {
CaseIDDropDownList.Text = caseIDRetrieved;
//CaseIDDropDownList.Enabled = false;
} else { try { CreateDataSet();
DataView caseDataView = new DataView(caseDataSet.Tables[0]);
CaseIDDropDownList.DataSource = caseDataView;
CaseIDDropDownList.DataBind(); }
catch (Exception ex) {
string script = "<script>alert('" + ex.Message + "');</script>";
} } }
The CreateDataset method that is called in the if..else statement is contains the following code.
private void CreateDataSet() {
SqlConnection caseConnection = new SqlConnection(strConn);
caseSqlDataAdapter.SelectCommand = new SqlCommand("Select CaseID FROM Cases", caseConnection);
caseSqlDataAdapter.Fill(caseDataSet); }
However when I load the page and as usual the condition that is supposed to bid the data is met, the gridview decides to displays as follows. Is it me or its the Datagrid?
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Oct 28, 2010
So here is the problem , Is it possible to get the "SelectedItem.Text" of a binded dropdownlist? because everytime I'm getting null Even though I'm having
items in the dropdownlist.
I'm getting the items that I want in the dropdownlist but I can't find out which one is selected.
[Code]....
here is my aspx code:
[Code]....
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Jul 30, 2010
can any one helpout my problem that how to insert more than one space between two strings while binding dropdownlist.
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