This problem is driving me nuts. I have labels inside a gridview. When i reference them, i keep getting a null error. This is definatly that it cant find the labels inside the template. below is my code that i am using.
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I'm trying to retreive values entered by users in the textboxes in the footer of the gridview and insert these values into another sql table.My code is as follows :-
protected void GridView2_RowCommand(object sender, GridViewCommandEventArgs e)
{
if(e.CommandName.Equals("addnew"))
{
TextBox t1 = (TextBox)GridView2.FooterRow.FindControl("tfrm");
string frm = t1.Text;
TextBox t2 = (TextBox)GridView2.FooterRow.FindControl("tsub");
string sub = t2.Text;
string cmd = "insert into suggestions values('" + frm + "','" + sub + "','c','c')";
con.Open();
SqlCommand com = new SqlCommand(cmd,con);
int a = com.ExecuteNonQuery();
GridView2.DataBind();
con.Close();
}
}
But the strings 'frm' and 'sub' returns null values.
Why would i be getting NullReferenceException if im setting the labels with values?In my page_load i have the following:
Label hireMess = (Label)FormView1.FindControl("hireMess");
Label hireEnd = (Label)FormView1.FindControl("hireEnd");
HyperLink hyptry = (HyperLink)FormView1.FindControl("hyptry");
and right below that i have 1 condition to check for and then set the Text value of the 2 labels.hireMess.Text = "It Was Successfully!";hireEnd.Text ="You will be re-directed to your Pool in 10 seconds.";I compared the page to production and eveyrthing is the same and production doesnt have any issues.. not sure why its coming up null.The error comes up for the first label:Object reference not set to an instance of an object. Description:An unhandled exception occurred during the execution of the current web request. Please 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:
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I am trying to return the table of Users and display it on a page which uses a masterpage.
My master page file called AjaxMaster.Master looks like this -
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I have a page with a datalist on it, with an image button and some labels in the datalist item(1,2)..
I have some more labels on the page which get their values from querystrings(17,18)..
I have more labels which are empty (34,35)
On image click in the datalist item, i want the labels from that item to add with the labels outside of the datalist, and the last lot of labels to show this number..
Currently it doesnt do this. Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
Label17.Text = Request["b1"];
Label18.Text = Request["b2"];
}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
DataListItem item = ((Control)sender).NamingContainer as DataListItem;
Label Label1 = item.FindControl("Label1") as Label;
Label Label2 = item.FindControl("Label2") as Label;
Label34.Text = (int.Parse(Label1.Text) + int.Parse(Label17.Text)).ToString();
Label35.Text = (int.Parse(Label2.Text) + int.Parse(Label18.Text)).ToString();
i want to get dynamically the Data Source value from which system iam acessing the website and concatenate in connection String
but still showing null value
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i have two labels inside the gridview and i want to compare it if they are equal or not!
lblAns and lblStudAns
I have setup my business object to have a create_date and edit_date members both datetime datatypes. My company want to display the create_date and edit_date fields in a gridview for each transaction. The problem i have is that after insterting a record it will have a valid create_date but no edit_date and when displayed in the gridview it defaults to datetime.minvalue (My default). How on earth do i show an empty field in my gridview for a null datetime field in the database?
I am using similar architecture to the Imar Spaanjaars example of a tiered solution. With a few small tweeks it has worked well for me for ages. I am passing a List<Database> to my object datasource which connects to my gridview.
I have a table on top of my gridview. My table contains labels. However, though I would like to align the size aka the length of the table with the length of my gridview so that everything looks decents. How do you go about doing so.
View 2 RepliesI have the following scenario shown below
Label: Name
ID Qty
1 10
2 5
Kindly note, the ID. QTy are currently in a gridview and the Label is a label on top of the gridview. I would like to export both the label and the gridview to excel...how can I do this.
Gridview is not being populated now that i built my objectdatasource in the code behind.. why. If i build the source on the aspx page and configure it that way, it returns results.. but when i try to build it in the code behind it just displays my empty template for the gridview.
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iam using asp.net2.0 with c# with sql server 2000 when iam executing the procedure in local system it is working fine.but when iam executing in client system procedure returns null value, i have checked all connection string , and session value all are working
I have GridView in UserControl (ascx) who is in another ascx.
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I have been struggling with this and it must be somthing I am missing. I have Griview and go to edit te row and when I click update and step through the rowupating procedure the value for CollectAmtEdit and txtCollectDate give te old values. If I do not bind them originally then they return blanks after I enter data in them. Here is the form Logic:
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Code behind:
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I am using
SqlHelper.ExecuteDataset(MyConnectionString, CommandType.StoredProcedure, "GetInformation", new SqlParameter("@ID", ID));
In my stored Procedure, I am doing a lot of calculation with joins and it took 19 sec to execute at my sql Server 2008. My application had been working perfectly for 5 days but now as database increases, I found a problem that my connection is breaking at that point. At Sql Server, it execute fine but when I add a breakpoint and watch the stored procedure is returning null.
i am using gridview to bind data from stored procedure. When i test query it get succeeded and shows all the data but when i run the page it does not show anything
View 3 RepliesI have 3 radio buttons op1, op2, op3 working as a group. In the code behind I check to see if a paticular button is checked, then do some processing. The problem is all the buttons return null. Checked in the debugger and all values are null even op1 which value is set to true.
Front end code for the buttons are:
<asp:RadioButton ID="op1" runat="server" AutoPostBack="True" Checked="True"
GroupName="searchOPT" oncheckedchanged="op1_CheckedChanged" />
<asp:RadioButton ID="op2" runat="server" AutoPostBack="True"
GroupName="searchOPT" oncheckedchanged="op2_CheckedChanged" />
<asp:RadioButton ID="op3" runat="server" AutoPostBack="True"
GroupName="searchOPT" oncheckedchanged="op3_CheckedChanged" />
The test in the code behind is:
if (op1.Checked)
{.....do stuff...}
if (op3.Checked)
{.....do stuff...}
if (op3.Checked)
{.....do stuff...}
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I have an error with this tutorial.
Line 13:
Line 14: Private Sub BindGrid()
Line 15: Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Line 16: Using con As New SqlConnection(constr)
Line 17: Using cmd As New SqlCommand("Customers_CRUD")
Imports System.Data
Imports System.Configuration
Imports System.Data.SqlClient
Public Class tessatusatu
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
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I'm having trouble getting selected rows in asp.net. i tried to debug it and found out that the answer to "chkRow.Checked" is always false eventhough it is selected. I'm new to asp.net.here is my code.
Protected Sub btnApproveYes_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnApproveYes.Click
Dim modID As String = String.Empty
For Each row As GridViewRow In gvModule.Rows
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I take a gridview on my web form ,In one column i display image & view link.My prob is that when any row has not image then do not show view link.
View 7 Repliesi have a grid view that displays a load of figures, and as there is a lot of zero's in these tables i wondered if it would be possible to just display nothing were there is a "0" ... just to make it look cleaner?
View 13 RepliesI have a Gridview showing the data on one of my tables, and when I try to edit the data in one of the columns after I click update, rather than updating the record with the new value I typed in, the rows become null as in, everything in the row I just edited disappears. This inmediatly makes my application crash because one of the fields in my table (IssueDescription) doesn't allows null values.
This is the code, which is actually 100% auto-generated from when I created the GridView control and specified in the options to implement update, delete, edit options.
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AutoGenerateColumns="False" DataKeyNames="ticketNum"
DataSourceID="SqlDataSource1" [code].....
What is making the rows turn into null after the update? I did some research and tried to define the Update behaviour myself using RowUpdating function. After hours of learning how to use it I got it to "work", but because the Update turns everything to null when it updates, the sqlconnection command I use to do the query sends null anyways. I can paste the C# code if you'd like to see it, though I'd rather not use it if the auto-generated by asp above can be fixed instead.
In asp I want to add row to my gridview when I read barcode. But when I want to add second row , gridview.datasource = null. So, my first row is removed from gridview in TxtBxBarcode_TextChanged event.
TxtBxBarcode and gridview are in the different update panels.
How can I prevent this "gridview.datasource is null when Postback" ?
I have 4 gridviews on a page that get databound with a datatable from sql. So I have created the sort/paging events for each. These were working fine. However now they do not work.
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HTML Declaration:
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Whenever you turn off the visibility of a column in Gridview, on Edit, the value becomes null because its never bound. The only way I know of stopping this behavoir is to put it in the DataKeyName list. Is there any other way to prevent this? I have quite a few columns that will not be displayed in this "release" but I want there for future extensibility. Also, in some cases these values will be used for calculations but the user should not see them. Is there no toggle property for "non-visible" items to remain "unchanged" or something of the sort?
View 3 Replies