Forms Data Controls :: Finding The ID Of The Row That Has Been checked / Getting Error
Jan 7, 2010
I have a datagrid setup where I have a column of checkboxes setup, several informational columns for the user, and a hidden ID column. I have set up the loop to check with checkboxes have been checked, but I am having troubles finding the ID of the row that has been checked. The following code results in a "Object reference not set to an instance of an object" error:
For Each row As GridViewRow In GridView1.Rows
Dim cb As CheckBox = row.FindControl("ParticipantSelector")
If cb IsNot Nothing AndAlso cb.Checked Then
Dim productID As Integer
productID = CType(row.FindControl("ID"), Label).Text
Response.Write("You have selected " & productID & "<br>")
End If
Next
I am sure that I don't have something right here.
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May 3, 2010
I have a GridView that I was previously populating via an ObjectDataSource, and this code was working perfectly (ie, when the checkbox was checked Checkbox.Checked = true):
CODE BEHIND:
[Code]....
[Code]....
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Mar 11, 2011
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkRDR1" runat="server"/>
</ItemTemplate>
</asp:TemplateField>
=========================================================================================
Dim checkbox As CheckBox = CType(row.FindControl("chkRDR1"), CheckBox)
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Aug 17, 2010
i am having one online test application in default page i have 1st question and 4 options will come and i am having two linkbuttons one is next and the other is previous and after selecting the answer of 1st question and after clicking the next button it is goin to 2nd question that is in the same page and error is this one if i select 1st answer of 1st question the same answer is repeating in 2nd question i want to uncheck this and in 1st question the answer selected should be checked only.
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May 4, 2010
[Code]....
and how to use both of those checkbox (for example: when i click update in my detailsview, if the checkbox is checked will return 1 and if unchecked will return 0 and insert that value to database)
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Dec 18, 2010
I have 13 checkbox which is consist of outlet locations, The way i store into database is converting the 13 outlet code and store in string type which is need to split it when the need to view it.
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|cLocCode |productcode |
|200,201,202,203,204,205 |xxxxxxxxxxxxxxxxxx |
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x Checkbox200.Checked x Checkbox201.Checked x Checkbox202.Checked x Checkbox203.Checked
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Feb 8, 2011
I am using following code on SelectedIndexChanged of Dropdownlist in GridView for filling txtCallCompletion.Text. When i am selecting first time it is coming correct and i am changing value of txtCallCompletion then i am selecting second checkbox then previous checked checkbox's txtCallCompletion value will be same as it is.
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[code]....
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Jul 22, 2010
I have a label and a checkbox that reside in a datagrid. When the checkbox is checked (OnCheckedChanged), I would like to send the Checkbox value and the label.text to a method. I don't have a way of retrieving the values. I've seen a lot about retrieving all of the values from a datagrid, (myDataGrid.Items), but am not sure how to get the value for a specific row in the datagrid.
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Sep 29, 2010
I am still studying to become a webintegrator and this is my private project to try and learn C# better.
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<asp:Repeater ID="rptQuestions" runat="server">
<ItemTemplate>
<div>
<div>
Spørgsmål
<asp:Label ID="lblQuestionHeader" runat="server" Text='<%#Eval("QuestionNumber") %>'></asp:Label>
[Code]...
What i need to do, is somehow find each CorrectAnswer checked correctly in the repeater holding the radiobuttons and give 1 point for each CorrectAnswer chosen by the user (if theres 10 questions there will be 10 repeateritems with 3 radiobuttons in each one) and write this into aspnet_Profile. Problem is i have no idea how to do this since it already seems a bit complicated in my head and i haven't had much C# yet. So any help would do and notice i do not ask for the entire coding but simply a push in the right direction.
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Nov 16, 2010
I have a gridview that returns several records for the same user and each record has a column with a check box. I need to allow the user to choose only one to check. Also one check box is always supposed to be checked. What is the best way to do it? I was thinking of writing a stored procedure that checks if only one is checked, and then returns true or false. I think there is a more efficient way to do it...
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Feb 17, 2011
i need to design an application in asp.net using gridview custom control. the gridview will show hundreds of records using paging with checkboxes in every row.
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Dec 20, 2010
i have a database of values that I am rendering in a table via the repeater control. (Previously I was using a gridview but I know require a repeater) I have a checkbox being 'repeated' for each record and I can get the id of each row to do some logic, but what I cannot get is whether it is checked or not as the value is null. As the database has no null values, I can only asume it is not binding for the checkboxes as current true values do not have a check in the box. The onCheckedChanged event carries out the logic required to change whether record is disabled via the database. With a gridview
Checked='<%# Bind ("Disabled")%>' was enough
<td
class="GridCentre"[code]....
is this done with the itemdatabound event? and how is it done?
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Sep 14, 2010
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May 14, 2010
I have a formview in edit mode, with submit button and checkbox. I want to click the button and have it test to see if the checkbox is checked. The ID of the checkbox is "TestCheckBox". I figured it would be something like, If TestCheckBox.Checked then, but if I type in TestCheckBox it says it's not declared, even though it is a control in the formview.
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Nov 18, 2010
I was trying to find out if there are any check boxes checked in the datagrid, if non of them is checked it should show me an alert to select atleast one.
My problem starts when there is paging in datagrid...
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Mar 17, 2011
I need to make sure only one checkbox gets checked in a GridView. I have tried a solution on here, but I get an error. The other is looping through the checkboxes in the gridview to get the value, in this case, a date.
[Code]....
And here is my code behind:
[Code]....
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Jan 13, 2010
I a using Gridview bind to a dataset. For this example, I am only setting up two columns.
1. Edit button
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When I run this code... the page is displayed... I click on the edit button... the row changes to edit mode and I CLICK the checkbox (can see a it checked).Then click on "Update" Button... which takes me to GridView1_RowUpdating event. If I check the status of the "box"... it's checked status is ALWAYS false Why?
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
<!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">
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Member_Id"
onrowupdating="GridView1_RowUpdating"
onrowediting="GridView1_RowEditing">
<Columns>
<asp:CommandField ShowEditButton="True" />
<asp:TemplateField HeaderText="IsPaid" SortExpression="status">
<EditItemTemplate>
<asp:CheckBox ID="chkIsPaid" runat="server" />
</EditItemTemplate>
<ItemTemplate>
<asp:Label id="Label1" Runat="server" Text='No'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>
CodeBehind:
public partial class Default3 : System.Web.UI.Page
{
private DataSet dsEmpList = new DataSet();
protected void Page_Load(object sender, EventArgs e)
{
BindGridView();
}
protected void BindGridView()
{
dsEmpList = GetEmpList();
GridView1.DataSource = dsEmpList;
GridView1.DataBind();
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
CheckBox box = (CheckBox)GridView1.Rows[e.RowIndex].FindControl("chkIsPaid");
if ((box != null) && box.Checked)
{
//do whatever
}
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex; // turn to edit mode
BindGridView(); // Rebind GridView to show the data in edit mode
}
}
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Nov 1, 2010
I want to count all checked checkboxes in gridview. How can I possiblty do that? I've tried several ways but didnt work. This is my code for checkboxes.
[Code]....
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Aug 25, 2010
i'm using a gridview and has a column of checkbox that is within a template field.
I want to do it in C# but I only found this code in VB
[Code]....
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Mar 25, 2011
let said my gridview have 3 records with checkbox features. If i want to delete the checked record, i will retrieve
the these records and store into a temporary datatable.After that , it will deleted the record if checked is true.However, it;s only
work when u delete one by one or whole record as once. This is because if u deleted the second record at position 1, then the third record
at position 2 will moved up.
[code]....
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May 9, 2010
I am trying to add the checked rows into the database by looping through but im getting this error:
Object reference not set to an instance of an object.
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.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
Heres my add click event:
[Code]....
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Jun 11, 2010
[Code]....
View 4 Replies
Dec 10, 2010
I have a gridview with paging enabled.How can i get the entire checked checkbox values s that i can save it into to a Table.Ie, if i havetwo checkbox checked in page1,three in page Two and two in page three etc.etc. i should get the entire values of a checkbox in a variable so that i can save it into a Table.
View 1 Replies
Jan 27, 2011
I want to loop through all rows in one column in a GridView to find all rows that has a checked checkbox. My code below only finds one checked checkbox, how should I modify it?
[Code]....
View 19 Replies
Jan 20, 2010
I have the Grid with Check box. here i want the Total of checked rows "CheckAmount".checkamount is one column in the grid i am able to getting the Total in single page(grid page=1). i am not able to getting the total of "CheckAmount" in multiple pages like (Grid Page=1 and Page=2 ) when i go to the second page i am not getting the 1st page Total.
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