C# - How To Get Empty Row In DropDownList
Jan 13, 2011
i have this citys in my database:
city1
city2
city3
city4
i what to see this in my DropDownList:
[empty]
city1
city2
city3
city4
this is my bind code:
SQL = "select distinct City from MyTbl order by City";
dsClass = new DataSet();
adp = new SqlDataAdapter(SQL, Conn);
adp.Fill(dsClass, "MyTbl");
adp.Dispose();
DropDownList3.DataSource = dsClass.Tables[0];
DropDownList3.DataTextField = dsClass.Tables[0].Columns[0].ColumnName.ToString();
DropDownList3.DataValueField = dsClass.Tables[0].Columns[0].ColumnName.ToString();
DropDownList3.DataBind();
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Aug 26, 2010
I'm working on ASP.NET 4.0 and I'm having problems for saving the selected value in a DropDownList.
I initialize it in the Web Control's PreRender method as follows:
if (!Page.IsPostBack)
LoadCountryList();
Where LoadCountryList's code is:
private void LoadCountryList()
{
var vr = new CountryRepository();
var countryList = vr.GetAllForList();
DdlCountry.EnableViewState = true;
DdlCountry.DataValueField = "code";
DdlCountry.DataTextField = "name";
dlCountry.DataSource = countryList;
DdlCountry.DataBind();
}
After I submit the form, I've noticed the DropDownList is empty(it's not before postback). If you take a look at my code, I've enabled the ViewState for this control, but I'm not getting any results yet. Does anybody know what's going on?
EDIT:
Here is the simple code of the control in the aspx file:
<asp:DropDownList Runat="server" ID="DdlCountry">
</asp:DropDownList>
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Dec 2, 2010
I've looked at answers to some similar question but I still can't seem to figure this out. I think I'm misunderstanding something about how ASP.NET works.In the standard ASP.Net 4.0 'Create a new Account' form, I've added a DropDownList containing Roles to be selected for the new account. in the aspx page, the control looks like this:
<asp:DropDownList ID="RoleList" Width="100px" runat="server"></asp:DropDownList>
I am then populating the List in the Page_Load Event:
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[code]....
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Sep 13, 2010
I m using MultiView and View Controls in my site. I have placed some DropDownlists in different Views containing data of YES/NO or some other data. I have put that data manually by Edit Items. But when i run the project my all DropDownList shows empty.
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Feb 9, 2011
A web site project, 4 pages. First page just has button links to redirect to another page. When button link is cliced, the data is retrieved from SQL Server through stored procedures and they are in a class file. Able to call the procedures and pass the information through SET Properties and right before the page is displayed, checked and data is in the dropdownlist control then redirect to show page. The dropdowlist is empty, should I be using something different to show the page with the data? Have tryied REDIRECT and then fill dropdownlist and its still empty on displayed.
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Apr 27, 2010
I'm trying to generate a dropdownlist in a GridView. However, my dropdownlist seem to be empty and I'm not sure how to fix it. Here's my code for the dropdownlist in my GridView & it's SqlDataSource.
DropDownList in GridView:
SqlDataSource for DropDownList:
[Code]....
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Mar 26, 2011
i have a dropdownlist that bind with sqldatasource1. everytime i load this page, dropdownlist will display directly the content of data.
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Nov 20, 2010
This code is used to render the first line empty.
[Code]....
return this error:
Sys.WebForms.PageRequestManagerServerErrorException: Exception has been thrown by the target of an invocation.
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Dec 2, 2010
I have a problem with my dropdownlist on edit he doesn't want to add any of his parameters to the update. I tried controlparameter and normall parameter both didn't work The folowing I have: Dropdownlist with Datasource: I Have a gridview with templatefields: I have the following asp.net code:
[Code]....
I have the following Business Layer where it connects to:
[Code]....
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Feb 19, 2010
I have a gridview with two bound fields. On clicking a button i want to display the values in first row of gridview in two textboxes. But if gridview cell is empty i am getting the text in textbox to which the value of cell is given as -' 'i know my problem will be solved if i use the template fields instead. But i want a solution while maintaining the bound fields ,if any.
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Jan 15, 2010
I have a sql database that on some field will have a empty string/field. I am using a Datalist to display my results. How do I not make the labels that are empty not display? Currently if the field is empty it will leave a space there which my goal is if the field is empty do not leave a white space instead move the other colunms up.
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Mar 4, 2011
I am working with a gridview that pulls data from a SQL database based on selections in dropdown lists. The source table has six columns for attributes of the selection, but depending on what is chosen, there could be anywhere from one to six of those that are empty (all null values). When the column is empty, I would like to have it hidden so the page is less clunky and confusing.
I've searched around for an answer for the past couple days, but what I have found so far is either related to hiding columns that you know are empty which I will not know or removing them in the SQL code which I think doesn't work if the column is called for in the gridview code and doesn't exist in the query.
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Sep 5, 2010
I have this code, how will I write the code so I can check if a textbox i empty? This way want work. Now it goes in if cellPhone != null all the time.
[Code]....
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Jun 27, 2012
When I click on the Alphabets it will show the details of a player...however, when that particular letters has no details of the player..I want to show."No results can be found"..Is there anyway to do it?
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["CurrentAlphabet"] = "ALL";
this.GenerateAlphabets();
[code]...
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Sep 2, 2012
i have 2 DDL in my page that when users select item from ddldistric1 item in ddlcity1 will change these are my code
protected void DDLcity1_SelectedIndexChanged(object sender, EventArgs e)
{
BindDistrictC();
}
private void BindDistrictC()
[code]...
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Jan 8, 2013
I am having two dropdownlist in my project,one dropdownlist for empid, another dropdownlist for month, if the user select the empid, the values are retrieved in the textbox.
In the second dropdownlist, if the user select the month in the dropdownlist it will display the leave details, its all working fine, if the user again select the first dropdownlist that means empid, I want to show the second dropdownlist as select month, how can do this.....
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Apr 15, 2010
I am having a problem with disabling DropDownList based on the chice of 1st DropDownList, there is no post back occuring, and it is a template based web app here is the current code:
<script type="text/javascript">
$(function() { var dropDownList1 = $('#<%= ddlUserType.ClientID %>');
var dropDownList2 = $('#<%= ddlMember.ClientID %>'); dropDownList1.change(function(e) {
if ( jQuery("#ddlUserType").val() != "ETOC") dropDownList2.removeAttr('disabled'); e.preventDefault();
else
dropDownList2.removeAttr('enabled'); e.preventDefault(); }
} );
</script>
what is happening now is page is blank and if I remove the above code everything shows, where I am going wrong. here is the plain and final javascript code which worked:
<script language="javascript">
function CheckDropDownState(lstbox)
{
if (lstbox.selectedIndex == 3) { document.forms[0].ddlMember.disabled = 1; }
else { document.forms[0].ddlMember.disabled = 0; }
}
</script>
and thew .aspx code: <asp:dropdownlist id="ddlUserType" runat="server" onclick="CheckDropDownState(this);"></asp:dropdownlist>
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Mar 29, 2011
I have a table and 7 column name.
I bind the 7 column name in one dropdownlist.
Now the problem is,how do I extract the data value in a dropdownlist?
For example,
Dropdownlist contain 7 column name
-subject_name
-subject_code
-venue
-time
-seat_no
-admission_no
-subject_id
when I click the subject_name,I want it to appear in a gridview
Example
Math|9.00-10.00|Hall|18|09090J|...
Below is my current codes which I have a problem.
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source= EN\SQLEXPRESS;" + "Initial Catalog=ms;Integrated Security=SSPI");
SqlDataAdapter adapSel;
string mySQL = "SELECT '" + dd_list.SelectedValue+ "' FROM examtimetable ";
adapSel = new SqlDataAdapter(mySQL, conn);
conn.Open();
DataSet dsSel = new DataSet();
adapSel.Fill(dsSel);
GridView1.DataSource = dsSel;
GridView1.DataBind();
conn.Close();
}
Previously I have bind 7 column name in my dropdownlist
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack == false)
{
SqlConnection conn = new SqlConnection("Data Source= EN\SQLEXPRESS;" + "Initial Catalog=ms;Integrated Security=SSPI");
SqlCommand sqlCmd = new SqlCommand("select column_name from information_schema.columns where table_name='examtimetable' and COLUMN_NAME not like '%ID'", conn);
conn.Open();
SqlDataReader ds;
ds = sqlCmd.ExecuteReader();
dd_list.Items.Clear();
dd_list.DataSource = ds;
dd_list.DataTextField = "Column_Name";
dd_list.DataValueField = "Column_Name";
dd_list.DataBind();
dd_list.Items.Insert(0, "Select Option");
ds.Close();
conn.Close();
}
}
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Nov 15, 2010
i use 2 dropdownlist with 2 object data source first dropdownlist to display departments name using object datasource (field to display DeptName , value of field DeptID)
second dropdownlist to display Employee name but depend on departments (field to display EmpName , value of field EmpID)
how to display employee name in dropdownlist depend on departments name in the other dropdownlist
2 tables
1 table deprtments with column (DeptID , DeptName , DeptDescription)
2 table Employee with column (EmpID , DeptID , EmpName)
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Mar 28, 2011
Currently,below is my code.
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source= E\SQLEXPRESS;" + "Initial Catalog=k;Integrated Security=SSPI");
SqlDataAdapter adapSel;
string mySQL = "select column_name from information_schema.columns where table_name='examtimetable' '" + dd_list + "'";....
I receive an error "Incorrect syntax near 'System.Web.UI.WebControls.DropDownList'."
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Sep 6, 2012
protected void DDLzone1_SelectedIndexChanged(object sender, EventArgs e)
{
BindDistrict();
}
[Code]......
here when i click on ALL item from ddlzone1 it just "ALL" item in ddldistrict
i want when i select "ALL" item from ddlzone1 in ddldistrict14 show all data from database
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Aug 12, 2012
i have 3 drop down list in my page
1-ddlzone1
2-ddldistrict1
3-ddlstore1
this is ddlzone1 code
protected void DDLzone1_SelectedIndexChanged(object sender, EventArgs e) {
DDLstore1.Items.Clear();
DDLstore1.Items.Add(new ListItem("select center", ""));
DDLstore1.AppendDataBoundItems = true;
SqlCommand _cmd = new SqlCommand("selectcenter", _cn);
[CODE].....
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Mar 8, 2010
I want to making another dropdownlist visible=false when clicking in dropdownlist on the same detailsview?
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Dec 9, 2010
I have a gridview with 3 nested dropdownlists in one cell on edit like this:To get the exact fields when the user clicks on edit I used the following code(yes it's messy)
[Code]....
The BLLOnderhoud is a class and the getReserveInfo is used to get the Model - Brand(merk) Information.Since the dropdownlists are nested in the gridview I can't call them directly and they can't call any of my functions.And this is the problem, when I change the dropdownfield Model the Auto field wich is the last dropdown(in the picture is a typo) should be binded like in the following code:
[Code]....
But the dropdownlist onDataBound event can't call any of my functions that are in my class.So my question is how can the onDataBound event of the second dropbox trigger a function? The only thing that the function has to do is to bind the 3rd dropdownlist
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Mar 25, 2011
I had use a combox to let user select staff name and then it will automatically retrive the responsible recommending officer and approving officer to display in other 2 dropdownlist.
my code works fine but when user select staff name each time, the page will reload once to refresh the dropdownlist.
user complaint and don't want the page reload every time, how can i disable the postback? I need to use ajax?
[Code]....
[Code]....
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