C# - Populating GridView Using EntityDataSource And QueryString?
Mar 23, 2011
I am new to EntityFrameWork so bear with me here. I have a webpage (page1.apsx) n page2.aspx.
Page1.aspx is showing gridview of following items:
EntityID
Name
Description
Whenever user is selecting some Entity then I am passing this EntityID to Page2.aspx. In Page2 I am having EntityDataSource and GridView. Also, the value needs to be populated is from different tables in this page. How you deal with this in EntityDataSource and populating it in GridView?
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Similar Messages:
Apr 4, 2011
I have an EntityDataSource I've mapped to the entity Resident which includes two navigation properties (Building1, Room1). I've set my GridView to use this EntityDataSource and set the EntityDataSource Include property to Building1, Room1 so it includes these navigation properties and have added these columns to the GridView. When I run the application instead of displaying the associated navigation property it shows this: webHousingAdmin.BuildingHow can I get it to display the actual value? Code looks like this for GridView:
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl1" runat="server" Text='<%# Bind("Building1") %>' />
</ItemTemplate>
</asp:TemplateField>
I've gotten it to display the actual value by using the following code:
<asp:TemplateField HeaderText="Building">
<ItemTemplate>
<asp:Label ID="lblBuilding" Text='<%# Bind("Building1.building_name") %>' runat="server" />
</ItemTemplate>
</asp:TemplateField>
But is there a simpler way to do this? This only displays the text, doesn't let me edit it...if I can do it as a boundfield that would be ideal.
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Feb 17, 2010
I have two SQL Server tables with Primary Keys (PK) and a Foreign Key (FK) linking the two tables:
1) Table "Order"
OrderID, int, PK
AddressID, int, FK
...
2) Table "Address"
AddressID, int, PK
City, nvarchar(50)
...
Then I've created an (ADO.NET) Entity Data Model out of those two tables. Now on my (ASP.NET) webpage I put a GridView with an EntityDataSource. In my GridView I want to display two columns:
OrderID City (belonging to that order and linked by the AddressID-key) How can I do that? My problem is: When I configure the Entity Data Source I can select an "EntitySetName" which can be either "Order" or "Address" but not both, nor can I select any kind of relationship. If I select "Order" as EntitySetName
then in the GridView I can add the columns
OrderID
Address
Address.AddressID
Adding the column "Address" displays empty cells. Adding "OrderID" and "Address.AddressID" displays the expected IDs. But how can I add the "City" of the related address to my GridView? Edit: Clarification:
The Entity Framework has created a class "Order" and a class "Address" corresponding to the database tables. The class "Order" has a reference to an "Address" object as a navigation property, corresponding to the 1-n relationship between Address and Order table. Basically I want to have a column in my GridView which displays Order.Address.City. I have tried to add a bound field with "Address.City" as data field to the GridView but it results in a runtime error ("no such property...").
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Apr 25, 2010
I'm face of a little problem when using GridView, an EntityDatasource and entity custom properties using a partial class. I'll describe it and I hope that someone has already find the solution because I try to figured out since two days.
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Jun 14, 2010
I'm not sure how to search for what I'm seeking, so I'm hoping to be pointed in the right direction.
I have 4 gridviews that contain the same 3 rows of data. For each gridview, I need to create a seperate gridview that will do some calculated values on the parent gridview like A3-A1, to put it in spreadsheet terms.
And at the very bottom I will have a total gridview control that will sum up each row from the parent gridviews. And under that gridview a final gridview to perform the A3-A1 calculation.
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Feb 2, 2011
I want to create a GridView in MVC and populate it according to Roles and Application states.
I have four Roles with assigned application states as follows:
Role1: VP (Verification Pending) , AE (Application Entered)
Role2: AS (Application Submitted)
Role3: AS (Application Submitted) , RE (Remarks Entered)
Role4: AA (Application Accepted) , AR (Application Rejected) , AF (Application Forwarded) , IS (Integrated to Supplimentary)
What I want to do is when a user logs in and clicks on a hyperlink "n Pending Applications", where n = int, a View opens up with a GridView. If the user is in Role1 then the GridView populates the number of Applications that has not yet been verified by him and also the number of new Applications entered.
Similarly, if the user is in Role2 then the Applications that are in the state of AS (Application Submitted) is populated and so on for other
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Feb 23, 2011
I am using an ADO Entity Model for my ms-sql database.
My database has a Resellers table which has ResellerID (primary key, int) and Name columns along with other data.
I also have an Orders table which contains OrderID (primary key, int), OrderDate, ResellerID (foreign key to Resellers.ReselerID).
If I just do a query like:
[Code]....
I am able to reference order.Reseller.Name just fine with no problems.
However I have an EntityDataSource on my page as follows:
[Code]....
Notice the Include="Reseller" attribute in the datasource... I also have a GridView tied to that datasource as follows: I cut some of it off for breavity:
[Code]....
Now what I have listed above will run with no errors, but what I want to do is replace the column that displays "ResellerID" with the equivilant to order.Reseller.Name. In other words I want my grid to display the reseller's name rather than the numeric ID.
I have tried to change the DataField to "Reseller.Name" but that will generate the following error:
A field or property with the name 'Reseller.Name' was not found on the selected data source.
Is there anyway to do this without me writing a custom select statement in my code behind?
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Jul 27, 2010
When I populate a gridview with a linq to sql datasource, I get the results I expect, however, when I try to use a linqToSQL query and try to databind that to the gridview, I get no records returns.
My Linq looks fine and I don't recieve any errors, so if someone could take a quick look and point out an obvious flaw.
[Code]....
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Feb 1, 2010
<EmptyDataTemplate>
<asp:DropDownList ID="ddlRateCode" runat="server" DataSourceID="odsRateCode" DataTextField="RateCode"
DataValueField="RateCodeID" SelectedValue='<%# Bind("RateCodeID") %>'>
</asp:DropDownList>
</EmptyDataTemplate>
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Mar 23, 2011
I have a GridView which is not bound to any DataSource. In my page load event I am writing this code:
protected void Page_Load(object sender, EventArgs e)
{
string getEntity = Request.QueryString["EntityID"];
int getIntEntity = Int16.Parse(getEntity);
[Code]....
Now I can see the the value is coming from previous page, but my GridView is not populating anything. What I am doing wrong here?
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Apr 16, 2010
I have a Grid view control in my aspx page. I have a textbox and a button control as well.
I will enter some query in the textbox amd when i click the button, the server side code will be executed and there i will populate the grid using a dataset. I will just give the dataset as datasource for gridview, and i will bind it.
Now i want to do this in browser scripting. I'm using a javascript function that will be called to execute the button click and in that i can use xml or json to send the query to generic handler file(.ashx).
I the ashx file i will use the query and will store the result in a dataset and now i want to send the dataset back to javascript, so that i can assign the dataset to the datasource of the gridview.
How can i send the dataset to the javascript.
in context.Response.Write(Result), i used string in Result and in responseText, i can easily get the values, but for this case what can i do?
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Sep 11, 2013
I have two dropdown lists that I am using to filter a gridview. I gridview is populating based on a query
select [AnnotationNumber],[AnnotationBy],[AnnotationType],[BusinessUnit] as Unit,[ErrorType],[ActualAgencyError],AnnotationComments,[sgkComments],[ActualAgencyError],Cust from vw_GridviewSource where Name = '"+@Name+"' and AnnotationDate = '"+@Stage+"'";
SqlCommand cmd = new SqlCommand(query);
gvSummary.DataSource = GetData(cmd);
The @Name and @Stage variables are the selected values of the dropdownlist. When I start I get the two drop down lists on my webform. When I select the values from the dropdownlists, nothing happens. I get no gridview. I added onselecedindexchange event both dropdownlists and even after both are selected nothing. I debugged the code and found that there is a point where the value is correct, but I still don't see the gridview. I have alsochecked the query associated with the databind and it works perfectly when I check it in SQL. I am enclosing all the code from the aspx.cs and aspx.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Trakker.aspx.cs" Inherits="AnnoTracker.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
[CODE]..
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Feb 15, 2010
I have a generic List which is populated with an object which has properties like FirstName, Surname etc.
If I bind a gridview to the list with autocompletecolumns = true, the Gridview displays the data in the List.
The code looks like:
[code]....
My question is:
How do I populate the DataKeyNames with the properties (FirstName, Surname) contained in the object that is contained in each element of the Generic List?
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Dec 3, 2010
Here is a snippet of my code...
<ItemTemplate>
<asp:LinkButton
ID="lbEdit"
runat="server"
CommandName="Edit"
>Edit</asp:LinkButton>
<asp:LinkButton
ID="lbNew"
runat="server"
onclick="lbNew_Click"
CommandName="New">New</asp:LinkButton>
</ItemTemplate>
Code behind...
Protected Sub gvPunches_RowEditing(ByVal sender
As
Object,
ByVal e
As System.Web.UI.WebControls.GridViewEditEventArgs)
Handles gvPunches.RowEditing
Dim i
As
Integer = e.NewEditIndex()
Dim ddl
As DropDownList =
CType(gvPunches.Rows(i).FindControl("ddlDiv"), DropDownList)
the question I have is when i enter this procedure in the code behind, ddl is nothing. what am I doing wrong in populating the dropdown for the row I am editing?
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Aug 14, 2010
i am using multiview and in View1, i have a gridview.i want to populate my gridview as
MultiView1.ActiveViewIndex=0;
this.Gridview1.Datasource=((Datatable)Session[cart1]);
this.Gridview1.Databind();
But it is displaying nothing on browser.
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Oct 5, 2010
when testing my query in the grid configuration wizard it works fine, but when i run the page it does not.
first - i select values from my cascading drop down list then enter values for two textbox (dates). then when i hit the button to populate my grid nothing is return back.
[Code]....
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May 25, 2010
I have a Gridview that has a template field containing a bound textbox (fieldname is 'Status'). I have an extra column containing an update button, which is designed to update the db with whatever is in the textbox.
What's happening is that when I load the form, the textbox is blank, even though there is existing data in the fields. If however I click the update button, all the textboxes in the Status column update and populate with the correct data from the database. I guess my question is why would bound textboxes not populate until an update command is run?
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Feb 19, 2010
I am developing an application using Sharepoint Designer.I need to retrieve data from a database for display on the screen.The way I am hoping to implement this is to have a Text box from which data is taken and at the click of a button passed to the procedure (which is within script tags) which calls a stored procedure passing it the value entered in the text box.The problem I've having is that the gridview is not displaying anything (i.e. other than text i entered in the EmptyText property of the gridview ("There are no records").
Below is my code
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-
[code]...
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Dec 10, 2010
I'm generating a number of calculated arrays in the code behind a ButtonClick event on a particular page. Stuff like:
Dim Delta(,) As Double = New Double(nPer - 1, 0) {}
For i = 0 To nPer - 1
Delta(i, 0) = Delta_Buckets(i, 0) + fwds(i, 0)
Next
What I want to do is convert this to a datatable and use this as a datasource for a gridview in a different page.
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Jan 28, 2011
VS2010 Ultimate ASP.NET 4.0 Web Appliction project
I have a simple aspx page with a GridView Bound to an ObjectDataSource utilizing a class object that returns a DataView.
There are no errors generated, but the GridView does not display any rows. If I check the return value of the ObjectDataSource in the Selected event in the Immediate window (?CType(e.ReturnValue,DataView).Count), there are 51 rows. However, (?Me.GridView1.Rows.Count) shows 0 rows. The exact same page in VS2008, ASP.NET 3.5 works fine. how to get the GridView to display the rows? What has been done to the GridView in 4.0?
Page and code below -
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm2.aspx.vb" Inherits=".WebForm2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
[Code]....
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Aug 29, 2013
I read your article on ASPSnippets and everything worked great. I am having one problem and this is preventing me from moving forward. When I select the edit for a row (I only have two columns), the drop down comes back blank (no records). I have looked at the code multiple times and can't see where I made a mistake. is it possible to control the width of the drop down list? I can't tell if the column automatically adjusts because I am not returning any records.
using System;
using System.Collections.Generic;
using System.Linq;
[Code].....
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Nov 5, 2010
during edit mode i populate the drop down in question with data based on a value selected in another drop down also in the gridview, all works find, but the paramater is not being updated with the selected value, i think this is because i do not call any Bind in the aspx side.
<asp:TemplateField HeaderText="Build Types">
<ItemTemplate>
<asp:Label ID="lblBuildTypes runat="server" Text='<%# Bind("BuildType") %>'></asp:Label>
</ItemTemplate>
[Code]....
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Aug 30, 2010
How can i use querystring for this-
Here in below code i have used querystring for sending imagename from this page to another page. Now i just want that with this imagename in also want to send span element's text with same querystring.How can i achieve this?
[Code]....
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May 7, 2015
The following code works well as long as I pass a querystring value to the datalist.
Private Sub BindGrid()
Dim id As Integer = Integer.Parse(Context.Request.QueryString("id"))
Dim strConnString As String = ConfigurationManager.ConnectionStrings("Conn").ConnectionString
Using con As New SqlConnection(strConnString)
Using cmd As New SqlCommand()
cmd.CommandText = "select Id, Name from tblFiles where Id=@Id"
[Code] ......
However, the page errors with the message "Value cannot be null." if I don't pass a value. I know that DataList does not have an EmptyItem Property like a Gridview control. I do not want the page to error if I don't pass a value. Need info to deal with empty values in a datalist.
Most websites have pointed me to this code to use:
<FooterTemplate>
<asp:Label ID="lblEmpty" Text="No Result" runat="server"
Visible='<%#boolean.parse(([b]list[/b].Items.Count=0).ToString())%>'>
</asp:Label>
</FooterTemplate>
The 'list' throws an error. The error is "Too few type arguments to 'System.COllections.Generic.List". I am not sure if the code is written in C# and that is what is causing the error. It seems that it should work but I can not figure out the 'list' error.
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Sep 6, 2010
I need to create a TemplateField column dynamically , which will contain dropdowlist controls. I've been using this
example to create my first dynamic columns and for the last column, the one that contains dropdowlist controls, I've written this class:
[Code]....
But what I don't know is, where should I populate the dropdownlist control?
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