Forms Data Controls :: Object Should I Use - Gridview Won't Work?
Oct 12, 2010
I would like to create a gridview that gets data from a datasource but doesn't display it in the normal fashion based on my table layout.
Example:
Table layout is:
Name Emp# Dept# Booking Code# AccessId
This is how it looks in the gridview but I would like it to look like:
Name: John Doe Dept#: 12
Booking Code#: 1234 Booking Code#: 67
AccessId: 33
What data object will give this?Gridview won't work I think.
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Similar Messages:
Feb 1, 2010
I am trying to get the value of the id field in my gridview but I keep coming up with this error when i do selectedValue or selecteIndex
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
How do I get that id? What I am trying to do is when the user select that link it will delete that information from the database. Here's my code:
[Code]....
[Code]....
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Jul 10, 2010
I would like to enable/disable the field BagNo in my gridview, depending on the value of another field in the gridview called ScriptNo, when I click the edit button I get this message "Object reference not set to an instance of an object".
here is the code
Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing
Dim row As GridViewRow = GridView1.Rows(e.NewEditIndex)
If DirectCast(row.FindControl("ScriptType"), TextBox).Text = "TTA" Then
[Code]....
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Dec 22, 2013
I am trying to implement the code URL...I have a database table with Integer type.Here is the running code line: Code in GridView:
<asp:TemplateField HeaderText="RegionNavn">
<ItemTemplate>
<%# Eval("RegionNavn")%>
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="lblRegionNavn" runat="server" Text='<%# Eval("RegionNavn")%>' Visible = "false"></asp:Label>
[code]...
On Edit Click, the DropDownList in the GridView brings the previously selected value.On Update Click, the error is: "System.FormatException: Input string was not in a correct format."
dCmd.Parameters.Add("@KystverketRegionID", SqlDbType.Int).Value = int.Parse(ddKystverketRegionID.SelectedValue);
When I use the following code:
ddlRegionNavn.DataTextField = "RegionNavn";
ddlRegionNavn.DataValueField = "RegionID"; // from RegionNavn to RegionID
On Edit Click, the DropDownList values in the GridView is not firing and the following error shows.Object reference not set to an instance of an object. How to implement the code when having a value of type Int ?
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May 30, 2013
I have this part in the Gridview.
<asp:TemplateField HeaderText="Student">
<ItemTemplate>
<asp:DropDownList ID="ddl" OnSelectedIndexChanged="ddl_IndexChanged" runat="server">
</asp:DropDownList>
[Code]....
After the change, when it is to bind data, I get this Exception message. Why?Object reference not set to an instance of an object.
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Oct 21, 2015
When I am executing the below code on Visual Studio 2008, then it is executing properly with out any error. But when i am executing it on Visual Studio 2012, then it showing me following error (System.NullReferenceException: Object reference not set to an instance of an object) at line 64
Why is it so?
.vb Code is below :
Imports System.Data.SqlClient
Imports System.Data
Partial Class grid
Inherits System.Web.UI.Page
Function constr() As String
Dim i As New IO.StreamReader(Server.MapPath("constr.config"))
[Code] ...
HTML code:
<asp:GridView ID="GridView1" runat="server" CellPadding="4" EmptyDataText="no record found" ForeColor="#333333" GridLines="None" AllowPaging="True" HorizontalAlign="Center" Width="303px" AutoGenerateColumns="False">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<EditRowStyle BackColor="#999999" HorizontalAlign="Center" VerticalAlign="Middle" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
[Code] ....
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Aug 30, 2013
I have a dropdownlist attached to a cell when edit is selected. I am using the following code to populate the drop down list with the value that is on the row.
dlBU.Items.FindByValue((e.Row.FindControl("lblBU") as Label).Text).Selected = true;
This works famously when I have a value in the cell. It fails when the cell has not yet been populated. Is there an if then clause that if the value of e.Row.findcontrol("lblBU") is null no default value?
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Apr 1, 2011
I am using Ajax ConfirmButtonExtender Control in GridView for Deleting the Record. I am also Exporting the GridData to Excel using Render Method. But when i click on the Export Button, i am getting below error Extender control 'confirmID' is not a registered extender control. Extender controls must be registered using RegisterExtenderControl() before calling RegisterScriptDescriptors(). Parameter name: extenderControl
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Sep 24, 2010
I have many divs in 1 page and each div consists of a gridview, the gridview is loaded by making AJax calls. On load of the page, all the grid load data properly. But now when i update any row in either of the grids, and make a call to the javascript that loads the grid in the page, it doesn't work rightly. Wat are the options to update/refresh the grid.
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Nov 8, 2010
I have a gridview with several ItemTemplates. The first contains a checkbox the rest contain textboxes. I then added dynamically some bound controls like this:
BoundField bdfPrivName = new BoundField();
clsUtilities.SetBoundFieldCenter(ref bdfPrivName, "PrivName", "Priv Name");
BoundField bdfDescription = new BoundField();
clsUtilities.SetBoundFieldLeft(ref bdfDescription, "PrivDesc", "Description");
BoundField bdfLive = new BoundField();
clsUtilities.SetBoundFieldCenter(ref bdfLive, "Live","Active?");
grdExisting.Columns.Add(bdfPrivName);
grdExisting.Columns.Add(bdfDescription);
grdExisting.Columns.Add(bdfLive);
I then use FindControl to locate the checkbox and textboxes and perform my logic based the result
foreach (GridViewRow gvr in grdMissing.Rows) {
mckbAny = (CheckBox)gvr.FindControl("ckbAdd");
mtxtApplyDate = (TextBox)gvr.FindControl("txtAddApplyDate");
mtxtDateToAdd = (TextBox)gvr.FindControl("txtAddDateToAdd");
mtxtDateToRemove = (TextBox)gvr.FindControl("txtAddDateToRemove");
etc.
This all worked fine. I then got a request to put the bound fields as the second, third and fourth columns, after the check box and before the textboxes. I found that this was easy to do by changing the Add's to Inserts as follows:
grdExisting.Columns.Insert(1, bdfPrivName);
grdExisting.Columns.Insert(2, bdfDescription);
grdExisting.Columns.Insert(3, bdfLive);
It looked fine of the page, but the FindControls, all of them fail to work.
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Oct 13, 2010
I'm using the code below to extract data from a gridview and populate it into textboxes for the days and two drop downs for Project and Category.
For some rows in the gridview everything but the category ddl populates correctly. If I click the row a second time the category ddl displays the correct category.
why I have to click twice for some rows? And how do I fix this?
[Code]....
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Aug 20, 2010
I have a gridview in which I am using a button field where the button type is "Image". The purpose of this button is to delete a row.
This works good. But when I add a confirmation on "RowDataBound", it does not work.
Here is my gridview.
[Code]....
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Nov 29, 2010
I would like to know if there is a way to debug the gridview and work around the code that is behind it.Right now i'm getting an error when i try to modify a record with this control. So, if any of you guys know a way to get this done,
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Jun 9, 2010
[Code]....
I have tryed this sorting code here in first post http://forums.asp.net/t/956540.aspx but it doesnt work. any tips?
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Apr 14, 2010
I have a gridview connected to my objectdatasource, i wrote a class for the database queries.Now when i do an update of record i get the id form the grid, when i click on delete i don't get the id, its 0.Is there an option to set the id? i can't find it in the gridview.
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Jan 20, 2011
i have been following the asp.net data access tutorials on this site. When i try to update, nothing happens. I believe the problem lies with my wrong coding on the BLL part. I'm using table adapters. Could anyone point out what iswrong with my code or tell my what the correct code is?
[Code]....
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Oct 26, 2010
I want to call a javascript function at onload event of gridview..But I am getting Compilation error. How can I do this?
Basically I am using a javascript in .aspx page which have a master page. I want to get the value from javascript in code behind.
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Mar 3, 2010
I have a GridView. I allow editing using:
[Code]....
As I allow editing of row, so I have GridView:RowUpdating(). In it, I check if the entered value is valid. If not, I have e.Cancel = true.
[Code]....
After I see the message box comes up, the textbox still stays the same. I expect the textbox will disappear just as if I have pressed the Cancel button. (By the way, the ClientUtil is a class someone has written for me.)
How do I make the e.Cancel = true works as if I press the Cancel button.
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Jul 13, 2010
i have a list of contacts (generic list) and i bind a gridview to it, i get the list displayed on the griview that fine, now i'm trying to get a contact object when i click a button on the gridview (button is a template field) i want to get the object back from the generic list, not just an ID using data key names, even the index of it in the generic list will do.
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Mar 30, 2010
I have the web page that meet the problem. There exists a gridview and filtering. When Select all by using function A, it is OK. when Filter by using function B, it cannot filter and return no rows. When Select all again, it is OK. I have tested that function B can return the corrected filtered rows. But when databind in the web page, it cannot show and no error?
<ContentTemplate>
<asp:GridView ID="gvwBOM" runat="server" DataKeyNames="ProductID"
AutoGenerateColumns="False" DataSourceID="objBOM" AllowPaging="True"
AllowSorting="True" BorderWidth="0px" CellPadding="3" CellSpacing="1" CssClass="grid-view"
OnRowCreated="gvwBOM_RowCreated"
OnRowCommand="gvwBOM_RowCommand"
OnDataBound="gvwBOM_DataBound" >
.........
<asp:ObjectDataSource ID="objBOM" runat="server"
SelectMethod="GetALTBOMs"
SelectCountMethod="GetALTBOMsCount"
EnablePaging="true"
SortParameterName="SortExpression"
TypeName="QI.BLL.WMS.ALTBOM" >
private void FillGridView(string filter)
{
if(filter == "0")
{
objDataSourceSelect="Afunction";
this.objBOM.SelectParameters.Clear();
}
else
{
objDataSourceSelect="Bfunction";
this.objBOM.SelectParameters.Clear();
this.objBOM.SelectParameters.Add("productSupplimentID", ddlTmp.SelectedValue);
}
this.objBOM.SelectMethod = objDataSourceSelect;
this.objBOM.SelectCountMethod = objDataSourceSelect + "Count";
this.gvwBOM.DataBind();
}
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Nov 23, 2010
Can't tell what is wrong here . It worked fine and I didn't did anything special in code-behind
I don't see any error just the same data in gridview
[Code]....
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Apr 6, 2010
I have the following code and when I click on "Edit" using Chrome or Safari, nothing happens.
[Code]....
I tried to remove my AJAX Updatepanel and the gridview worked.
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Nov 4, 2010
I have a simple GridView with AutoGenerateColumns,Edit and DeleteButton = true
It's data source is a DataTable dynamically generated.
Since i don't want to use object data source, i just catched Delete event and deleted rows from datatable and made a new databind. It works.
I tried to use also AutoGenerateEdit button, but when i click on Edit command field, nothing happes. So i decided to handle by myself edit events, and changed datagrid in this way:
<asp:GridView runat="server" ID="dettaglioprodotti" BackColor="White" BorderColor="#DEDFDE"
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Apr 1, 2010
Long story short: I'm basically trying to learn visual web developer/asp.net/and how to get all this to work on a shared hosting environment. The idea is to eventually develop this into something a friend of mine with a garage can use to allow his customers to check their various maintenance records. I basically made a small database with a couple of test tables in it and a gridview to display data based on a variable passed from a text box. I finally got it working on my shared hosting server with just one such 'application', but when I tried to add a second one, both stop working. If I put one in default.aspx, and the other in default1.aspx, they both work perfectly. I've tried using the same dataset for both, and different datasets for each, and same behavior. Also tried using 1 and 2 objectdatasources with the same results. Also tried putting each in their own content placeholders and no change. From my research into the subject, I've come to the conclusion that more than one gridview isn't the problem, so I'm extra stumped now. I'm guessing it's something relatively simple for someone who knows this stuff. Oh, I thought it may have something to do with not using default values, so the 'tables' weren't being drawn, so there wasn't 'room' to do so, but after splitting the apps into two different divs, and floating one bottom/right, again, no change.[URL](first working example)[URL](second working example)[URL](both in same page, not working - might not be up yet if someone reads this quickly)
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Feb 26, 2010
In my master page, I defined the css which loads a background image: img_mnusep.gif
<style type="text/css">
.ListHead2
{
background-color: #E0E3E8;
height: 20px;
color: #000000;
font-family: Tahoma, Arial, Verdana, Tahoma, Arial;
font-size: 8.5pt;
font-weight: normal;
[Code].....
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