I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
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My gridview code is -
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I decided to use the CalendarExtender on a project and I converted it from VS 2005 to Web Developer 2010 Express. I initially added the AJAX toolkit for ASP.NET 4.0 and the calendar extender worked fine. However, I realised that the server didn't have ASP.NET 4.0 installed and I thought it would be simpler to add the toolkit for 3.5 instead and change the target framework to 3.5. I tried and then the CalendarExtender did't work at all. When you click the textbox nothing happens. There is the error on page - 'sys.extended.ui.textboxwrapper is null or not an object'
I tried switching the project back to 4.0 and using the other one and that no longer works for some reason. The same in 2008 Web Developer Express. I've clearly done something wrong along the way, but I can't work out what it is.
Here's the source for a page on a test Web Developer 2008 Express project.
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I am using grid view as mentioned below, it is giving me error "object reference not set", but if comment allowpaging and pagesize lines, it works. let me know whats wrong I am doing?
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i have an application wherein i have incorporate a "Remember Me" feature for the login screen. I do this by creating a cookie when the user logs in for the first time, so next time when the user visits the site i get the cookie and load the user information.
i have written the code for loading user information in a common class in the App_Code folder...and all my pages inherit from this class.
code for loading the user info is as follows:
public static void LoadUserDetails(string emailId)
{
UsersEnt currentUser = UsersBL.LoadUserInfo(emailId);
if (currentUser != null)
HttpContext.Current.Session["CurrentUser"] = currentUser;
}
Now the problem is i get an "Object reference" error when i try to store the currentUser object in the session variable (even though the currentUser object is not null). However the password property in the currentUser object is null.
I have a nested gridview
i get error:Object reference not set to an instance of an object
when i try to get the text in the footer template of the inner gridview when clicking on the linkbutton!!!
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I am using C# and VS 2008 attached with access database, where Date1 is the PKey in Text defined.
I am getting the above error when i am trying to insert it into the access database.
here is my code
aspx :
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Code Behind :
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I tried to get the heade row text with the following code, but it failed.
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Error returned was "Object reference not set to an instance of an object." on this line:
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The stored proc fired to populate my grid view gets a column CasNo.The GridView has a DataBound item for CaseNo.
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Then Why does this get null value: string caseNo = dataRow["CaseNo"] as string;
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let me see if I can explain this clearly. I have a gridview control
and I am trying to use the Edit function. In my gridview, there are numerous rows. I pick one to change and click Edit. I then see the boss name in my gridview and click "Change". When I click Change, I'm expecting two fields to appear, one is a label, the other is a DropDownList. I get this error when I click:
System.NullReferenceException was unhandled by user code
Message=Object reference not set to an instance of an object.
Source=App_Web_lzmklgbg
StackTrace:
at Training_TRManageOrg.LinkButton1_Click(Object sender, EventArgs e) in d:projectsediting.aspx.cs:line 108
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:
Gridview HTML:
<asp:TemplateField HeaderText="Director">
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("director") %>'></asp:Label>
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Change</asp:LinkButton>
<asp:Label ID="Label4" runat="server" Text="Director" Visible="False"></asp:Label>
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<asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="trDirector"
DataTextField="name" DataValueField="id" onselectedindexchanged="DropDownList2_SelectedIndexChanged"
Visible="False"></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("director") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Code Behind:
protected void LinkButton1_Click(object sender, EventArgs e)
{
DropDownList DropDownList1 = ((DropDownList)FindControl("DropDownList1"));
DropDownList1.Visible = true; // this line is where the exception occurs
Label3.Visible = true;
}
I figure I must be overlooking something so I'm asking what am I missing?
So I have followed this tutorial to try and me edit a record in a datalist.
[URL]
When I click update after updating anyfield it throws a NullReferenceException was unhandled by the user code. Here is my code.
protected void DataList1_UpdateCommand(object source,
I am trying to assign user control from another user control ..first time its binding control successfully but when we refresh the data its giving error
saying "Object reference is not set an instance".
how to refresh data from another user control ...
My senerio below :
1 Aspx page
2. User control
calling usercontrol databinding method from aspx page but once it get refreshed ,not allowed to bind it again..
I am declaring a list in my class, populating the list in page load and using the list in various methods in this class. But, I get this error at every instance where I use this list in the methods. Error: System.NullReferenceException: Object reference not set to an instance of an object.
public partial class ViewBG1 : HealthServicePage
I am attempting to use a CustomValidator control to validate a FileUpload control that is present in my Gridview's EditItemTemplate
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I'm not calling the FileUpload control correctly, because I am getting the "Object reference..." error
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:
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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
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in my default.aspx page i have a dropdown List and a textbox with a submit button below that there are 2 listbox... and the dropdown list holds the names of the listbox
my logic here is to select an item from the dropdown list and put some text in the text box and submit the form which will add an item to the listbox selected.. but when i do this i get an error saying Object reference not set to an instance of an object. i tried to figure out the problem and found that when i remove the reference to the Site Master Page it works fine and when i undo and apply my reference back to the Site Master Page i get the same error.
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I have a FormView with a FileUpload to upload an image in a database.
I keep getting an object reference error.(view code)
I am using this same script to upload the image to the database, but when I try to update the file upload I get the error.
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iam using calender control in asp.net 2.0 as it is using master pages.. iam opening a window form content pages.. on window.close it is giving me null object as its not getting form name code on content page:
<a onclick="openwindow();" ahref="#">
<img src="Images/calendar.gif" style="width: 20px; height: 20px" border=0/></a>
<input ID="Text1" runat="server" readonly="readOnly" type="text" />
function openwindow() {
window.open('/Calender.aspx', 'calendar_window','width=154,height=188');
}
code on opened window from content page
protected void Calender1_SelectionChanged(object sender, EventArgs e)
{
string strjscript = "<script language='javascript'>";
strjscript += "window.opener." + HttpContext.Current.Request.QueryString["formname"];
strjscript += ".value = '" + Calender1.SelectedDate.ToString("yyyy-MM-dd") + "'; window.close();";
strjscript += "</script" + ">";
Literal1.Text = strjscript;
}
protected void Calendar1_dayrender(object sender, DayRenderEventArgs e)
{
if(e.Day.Date==DateTime.Now)
{
e.Cell.BackColor = System.Drawing.Color.LightGray;
}
}
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>
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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 ?
I have this part in the Gridview.
<asp:TemplateField HeaderText="Student">
<ItemTemplate>
<asp:DropDownList ID="ddl" OnSelectedIndexChanged="ddl_IndexChanged" runat="server">
</asp:DropDownList>
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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.
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"))
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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" />
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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?
Object reference not set to an instance of an object.
iam getting this Error Just created the controls as an null and how to create the object for reference
1) as my analysis i got the information that i need to create the object reference with new keyword but how to do it script using c#
public TextBox txtEventDate = null;
public Calendar calEventDate = null;
public Label lblResult = null;
protected void calEventDate_SelectionChanged (Object sender,EventArgs e)
{
this.txtEventDate = this.FindControl("txtEventDate") as TextBox;
this.calEventDate = this.FindControl("calEventDate") as Calendar;
txtEventDate.Text = calEventDate.SelectedDate.ToString ("d");
}
protected void btnSubmit_Click(Object Sender,EventArgs e)
{
this.lblResult = this.FindControl("lblResult") as Label;
lblResult.Text = "You Picked" + txtEventDate.Text;
}
</script>
I have the following code on RowDataBound my gridview:
If (e.Row.RowType = DataControlRowType.DataRow) Then
e.Row.Attributes.Add("onkeydown", "javascript:ChangeRowColor('" & e.Row.ClientID & "')")
e.Row.Attributes.Add("onkeyup", "javascript:ChangeRowColor('" & e.Row.ClientID & "')")
e.Row.Attributes.Add("onclick", "javascript:ChangeRowColor('" & e.Row.ClientID & "')")
Dim lbl As Label = CType(e.Row.FindControl("BOD_NPRGSTA"), Label)
lbl.Attributes("onclick") = Page.ClientScript.GetPostBackClientHyperlink(GridView1, "Select$" & e.Row.RowIndex)
End If
I would use it to intercept the click on the row of GridView when I click on the Label lbl.The problem I have because when I click on the same label me "smashing" the gridview itself. (He added a blank row for no reason).
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this code give that solution.but if any one of the field have null(example:r.urrQuickLinkRights contain the NULL) then only it will throw error like Object reference not set to an instance of an object.
