Dropdowns Failing With Databinding Methods Such As Eval(), XPath(), And Bind()
Jan 4, 2011
I have four fields on my insert form: Server, Farm, Silo and Reason. Farm and Silo populate based on the name of the server that is entered. If I take out the SelectedValue='<%# Bind("value") %> the form doesn't error out, but the fields don't post back to the DB.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Page Language="C#" %>
<html dir="ltr" xmlns="http://www.w3.org/1999/xhtml"> runat="server">
<meta content="en-us" http-equiv="Content-Language" />
[code]...
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Similar Messages:
Apr 3, 2010
I am getting the following error
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
but all I am trying to do is inside a ASP.NET REPEATER Control
<% if ( Eval("Message").ToString() == HttpContext.Current.Profile.UserName) %>
<% { %>
<asp:ImageButton runat="server" etc.... />
<% } %>
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Jan 22, 2010
i have a FormView, it renders fields from a SQLServer database but also much static text specific to the database value I get. I dont know if this can be done in the code behind and put all this in a function . I put it in my formview
<ItemTemplate>
<% If Eval("Feature1") = "Yes" Then %>
<%# Eval("Username") %> A lot of text
<% elseIf Eval("Feature1") = "No" Then %>
<%# Eval("Username") %>
A lot of different text
<% End If %>
</ItemTemplate>
If I do the code above I get error message:
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. Can this be done within the formview?
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Aug 11, 2010
[code]....
gives me error: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
I could write : <%# Eval("SaveDate") != DBNull.Value ? do magic But I need to do lots of html magic in if statement.
I know I should add # in order to use Eval, but not sure about correct syntax.
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Mar 9, 2010
I have a big problem...I have made a page has a Data FormView controland the insert template of this Formview control has DropDownList to allow the user to choose section (SectionsDDList)..and there's also another DropDownList allow the user to choose a teacher (TeachersDDList)...more infothe SectionsDDList get the section list from SqlDataSource control which the "Select Command" of is:"SELECT section_id,section_id FROM sections"the TeachersDDList get the teachers list from another SqlDataSource control which the "Select Command" of is:"SELECT teacher_id,teacher_name FROM teachers WHERE (section_id = @section_id)"finallyI want the TeachersDDList to be filled with teachers according to the selected section from the SectionsDDList...So,I enable the Auto postBack function of the SectionsDDListand add the next code for the SectionsDDList_SelectedIndexChanged event:TeachersDataSource.SelectParameters["section_id"].DefaultValue = ((DropDownList)sender).SelectedValue;be aware that both of the SectionsDDList & TeachersDDList have been Bounding to a column...and the problem I have faced is that:Exception Details: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.maybe you want to know the Stack Trace:[InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.]
System.Web.UI.Page.GetDataItem() +93
System.Web.UI.TemplateControl.Eval(String expression) +33
ASP.cpanel_managecourses_aspx.__DataBinding__control82(Object sender, EventArgs e) in
[code]...
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May 10, 2010
I am showing state,city, zipcode in cascaded format. I designed cascade dropdown with asp dropdown list controls. I am loaing the citys & zipcode based on selection index changed.. here when I am selecting city the request is sending to server & its loading citys....
I don't want see post back operation on my page when I am selecting city & zipcode. So I am thinking to use Ajax cascade dropdown list to avoid sending the request for each selection.
If I use Ajax Cascade dropdownlist can i cascade the loading of citys & zipcode without using webservices?
If I use only webmethods for cascade dropdown it will work ?
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Dec 10, 2012
have been using hyperlink field and bind it using eval
NavigateUrl='Test.aspx?cid=<%# Eval("cat_id") %>' but it is not taking eval value.it is showing eval in link
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Feb 24, 2011
I have three cascading dropdowns on my web page and they work fine. The issue I am facing is that there are other controls on the page which cause a postback and with each postback the cascading drop downs are being re-populated (service methods are called) which is becoming a performnace issue.
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Sep 8, 2012
SqlCommand _cmd1 = new SqlCommand("Viewstate2", _cn);
_cmd1.CommandType = CommandType.StoredProcedure;
_cmd1.Parameters.AddWithValue("@behcode", data);
string data1 = Request.QueryString["id"].ToString();
_cmd1.Parameters.AddWithValue("@id", data1);
_cn.Open();
SqlDataReader _dr1 = _cmd1.ExecuteReader();
while (_dr1.Read())
{
lblprice.Text = _dr1["price"].ToString();
Lbldate.Text = System.Convert.ToDateTime(miladitoshamsi(Eval("Date"))).ToString(" yyyy/MM/dd");
In the above code I get the following error
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.Source Error:
Line 97: lblprice1.Text = _dr1["price1"].ToString();
Line 98: lblprice.Text = _dr1["price"].ToString();
Line 99: Lbldate.Text = System.Convert.ToDateTime(miladitoshamsi(Eval("Date"))).ToString(" yyyy/MM/dd");
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Feb 24, 2011
I am using an asp.net details view. I added an entry into the details view like so...
<asp:BoundField DataField="DTMON_F" HeaderText="Monday Start:" InsertVisible="False"
ReadOnly="True" SortExpression="DTMON_F" Visible="false" />
<asp:TemplateField HeaderText="*Monday Start: " SortExpression="DTMON_F">
<EditItemTemplate>
[Code]....
Now I need to FIRST concatinate the values from the dropdown then bind the data gathered in the edit template form the 3 dropdowns. How might I do that?
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Oct 26, 2010
I have a gridview which I load with data on click of a button. For some reason the paging did not work. The paging number shows up but clicking on page # 2, 3 or 4 does not take you anywhere. the grid just disappears on clicking them. right after that when i click the button to generate the grid, the grid came up this time the gird is on page 2 or 3 instead of 1.
I have the following on page_indexing properly.
Protected Sub GV_Document_Hide_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GV_PSIDocument_Hide.PageIndexChanging
GV_Document_Hide.PageIndex = e.NewPageIndex
End Sub
I even tried by adding the databind() code inside the pageindexchanging as suggested in other threads but that didn't make any difference.
The only way I could get this going was by populating/loading the grid on page_load. I have to assign datasource & databind it every time irrespective of even postbacks. I tried IsNotpostback then the paging failed again Why does gridview needs loading on page_load every time if the paging needs to work properly?
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May 19, 2010
I have a dropdownlist that gets data through entity objects, but with a navigation. But I get an error trying to do this.
<asp:DropDownList ID="ddlVacancy" DataValueField="ID" DataTextField='<%# Eval("Position.Name") %>'
runat="server" Width="200px"/>
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Jul 22, 2010
I want to know where lies the difference between these two.I had a google search on this topic and a lots of replies and each of them tell the same thing:
Eval means one way binding(i.e;readonly)
Bind means two way binding(i.e;both read as well as write the datasource)
but none of them explained it more clearly.all i want to know is how can i use the Bind to update/insert something from the datasource?
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Oct 25, 2010
I have in my code behind the following property
public string Firstname {get;set;}
when I want to bind it to some textbox I do the following:
<asp:TextBox runat="server" ID="txtFirstname" Text='<%# Bind("Firstname") %>'/>
then I want value put in this textbox to be set in my Firstname property (because I want to process it e.g. save this value) in my presenter.
[code]....
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Aug 27, 2010
I got the difference between Bind and EVal from here. Bind will do both way reading and writing. And Eval do only reading. So any function only for writing?
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Oct 19, 2010
I'm trying to format the following:
<%# Bind("TimeOfDay","{0:HH:mm:ss}") %>
<%# Eval("TimeOfDay","{0:HH:mm:ss}") %>
<%# Bind("TimeOfDay","{0:HH:mm:ss tt}") %>
[code]...
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Sep 30, 2010
my link button -
<asp:LinkButton runat="server" ID="lbtnEdit" Text="edit" OnClientClick="javascript:msgDisp('<%# Eval(LocationId).toString() %>')" />
and the javascript msgDisp is-
<script type="text/javascript" language="javascript">
function msgDisp(lid) {
alert(lid);
}
</script>
but it is not giiving LocationId in pop but the whole string <%#......%> is comin in popup message. How can I pass Eval values in javascript.
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Mar 26, 2010
Recently I was asked the following question at interview."What are the different way to bind a Data Control in ASP.Net".
I have answered
Typed DataSet
Collections
Stored Procedure.
The interviewer expecting a lot more. Can anyone explain me the different way that we can bind the data controls?
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Dec 6, 2010
I am using panel to hide and display certain controls on a page, On one of my panel i have three drop down, all i want is to make sure that user has selected something from the dropdowns otherwise they cant proceed, i am using the requiredfield validator but its just not working
[Code]....
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Feb 2, 2010
I m tring date bind from database.
I have a date=2/2/2010 12:00:00 AM
i want to show only 2/2/2010
I m use that code source with a Repiter control <%#Eval("Course_Date")%>
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Sep 8, 2010
I have a repeater I've databound with a generic arraylist from a LINQ query (.ToList() ) in the code behind.
I was using
<%# Bind("FirstName")%> but noticed
<%# Eval("FirstName")%> works just as well.
Is it better to use Eval or Bind? or does it depend on the situation?
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Mar 11, 2011
I have 45 dropdown lists in my asp page. There are some methods that I can apply to all of these dropdowns. Is it possible to convert them into an array of dropdowns for ease of use?
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Jun 29, 2010
i have one hidden field and i want to bind it with two values of my data base separated by an coma. some thing like
->asp:HiddenField ID="hfRstidDate" runat="server" Value=<%# DataBinder.Eval(Container.DataItem, "tsk_ID"),DataBinder.Eval(Container.DataItem, "Date_Worked").ToString())%>
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Feb 11, 2010
I have a label in a gridview where the text is set to <%Bind("lname")%> . I want to make it say thiis <%Bind("lname" + "fname")%>. I've been having a hard time making .net do this. I also want to add a "," or some other unrelated caracter?
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Dec 8, 2010
i would like to know if its posible to change an eval binding of a label on a mouse click. something like:
<asp:Label ID="Label2" runat="server" Text='<%# Bind("TitluAnunt") %>'></asp:Label>
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