ASP.NET

Can't figure out the error:does not exist in the current context

30-Dec-07 21:05

Hey,
check it out..

May be it will help you.

Link[^]

Thanks,
Sun Rays

To get something you must have to try once.

My Articles

Albert8330-Dec-07 20:28

Albert83

30-Dec-07 20:28

Hello everybody,

I am getting an error: The name 'DataList1' does not exist in the current context.
DataList1 is a data list the code is in two pages:
Have no idea what the problem is. Any assistance is appreciated.

groups.aspx, and groups.aspx.cs

groups.aspx:

I remobed the open tags so that the code can be seen.

asp:DataList ID="DataList1" runat="server" DataSourceID="ChalkDL">
ItemTemplate>
asp:TextBox ID="postComment" runat="server">
asp:Button runat="server" OnClick="postBtn_Click" ID="postBtn" Text="Post!" />
/ItemTemplate>
/asp:DataList>

groups.aspx.cs
protected void postBtn_Click(object sender, EventArgs e)
{
SqlDataSource PostDS = new SqlDataSource();

System.Web.UI.WebControls.TextBox PostText = (System.Web.UI.WebControls.TextBox)DataList1.FindControl("postComment");

PostDS.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();

PostDS.InsertCommandType = SqlDataSourceCommandType.Text;
PostDS.InsertCommand = "INSERT INTO GroupChalkboard (Text, GroupID, UserID, CreatedDate) VALUES (@Text, @GroupID, @UserID, @CreatedDate)";

PostDS.InsertParameters.Add("Text", PostText.Text);
PostDS.InsertParameters.Add("GroupID", pid.ToString());
PostDS.InsertParameters.Add("UserID", Session["UserID"].ToString());
PostDS.InsertParameters.Add("CreatedDate", DateTime.Now.ToString());

PostDS.Insert();
}

Re: Can't figure out the error:does not exist in the current context

Imran Khan Pathan30-Dec-07 20:57

Imran Khan Pathan

30-Dec-07 20:57

Albert83 wrote:
System.Web.UI.WebControls.TextBox PostText = (System.Web.UI.WebControls.TextBox)DataList1.FindControl("postComment");

This line should be
TextBox PostText=(TextBox)DataList1.Items[IndexHere].FindControl("PostComment");

Albert83 wrote:
I am getting an error: The name 'DataList1' does not exist in the current context.

Can you get DataList1 control in codebehind side?
If no, It should be inherit problem of the page.
Check page directory of groups.aspx and class name of groups.aspx.cs.

please don't forget to vote on the post that helped you.

Re: Can't figure out the error:does not exist in the current context

Albert8330-Dec-07 21:04

Albert83

30-Dec-07 21:04

I can't get the DataList in code behind that's the problem. The weird thing DataList1 does show up in the list and I can choose Items property and find control property. But when I run it, it says DataList1 does not exist in the current context.

How to resolve it ?

That's aspx:
%@ Page Language="C#" AutoEventWireup="true" CodeFile="groups.aspx.cs" Inherits="groups" %>

that's aspx.cs
public partial class groups : System.Web.UI.Page
{

Also

In this code: TextBox PostText=(TextBox)DataList1.Items[IndexHere].FindControl("PostComment");

what's Items[IndexHere] - what index is that. Should I count the number of items in the ItemTemplate?

Re: Can't figure out the error:does not exist in the current context

Imran Khan Pathan31-Dec-07 0:30

Imran Khan Pathan

31-Dec-07 0:30

Albert83 wrote:
The weird thing DataList1 does show up in the list and I can choose Items property and find control property.

Did you get runtime error or compile time error?

Albert83 wrote:
In this code: TextBox PostText=(TextBox)DataList1.Items[IndexHere].FindControl("PostComment");

what's Items[IndexHere] - what index is that. Should I count the number of items in the ItemTemplate?

Yes.you have to do looping through datalist items.

please don't forget to vote on the post that helped you.

Re: Can't figure out the error:does not exist in the current context

Albert8331-Dec-07 7:57

Albert83

31-Dec-07 7:57

I got the error after I clicked Run, and it says Build failed. I guess it compile erro. What's the difference between run time and compile.

Checkbox in a grid

SreejithAchutan30-Dec-07 20:00

30-Dec-07 20:00

If we have a checkbox in a grid when we check the the checkbox a javascript function will be called and if we uncheck the same checkbox another javascript will be called.How is it possible...Its Urgent

http://www.google.com/search?source=ig&hl=en&rlz=&q=Datagrid+with+checkbox&btnG=Google+Search[^]

Michael Sync30-Dec-07 20:03

Michael Sync

30-Dec-07 20:03

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

neerubee30-Dec-07 20:08

neerubee

30-Dec-07 20:08

Check this link
http://www.c-sharpcorner.com/UploadFile/sd_patel/DataGridAndCheckBoxes11232005060439AM/DataGridAndCheckBoxes.aspx[^]

Thanks & Regards
Niranjan

Sun Rays30-Dec-07 20:43

30-Dec-07 20:43

Hey,
try this..

Javascript function

var chkT;<br />
function Test(chkT)<br />
{<br />
    alert(chkT.checked);<br />
}

Add template filed. In that add checkbox and then find control in RowDataBound event of Gridview.

Code behind file.

try<br />
            {<br />
                CheckBox chk = (CheckBox)e.Row.Cells[6].FindControl("chkTest");<br />
                chk.Attributes.Add("onclick", "javascript:Test(this);");<br />
            }<br />
            catch(Exception ex)<br />
            {<br />
            }

See whats happening...

Thanks,
Sun Rays

To get something you must have to try once.

My Articles

SreejithAchutan30-Dec-07 21:15

30-Dec-07 21:15

Thanks for ur kind reply.

I tried like that and i got the click event ,but the pbm is when i uncheck the checkbox i want to call another javascript function.

Sun Rays30-Dec-07 21:39

30-Dec-07 21:39

Hi,
when you will uncheck you will get item.checked = false.
so you can write if condition.

if(item.checked == true)<br />
{<br />
<br />
//call here Checked function<br />
}<br />
else<br />
{<br />
//call here Unchecked function<br />
}

Hope it will help you

Thanks,
Sun Rays

To get something you must have to try once.

My Articles

SreejithAchutan30-Dec-07 21:54

30-Dec-07 21:54

CheckBox ch = (CheckBox)e.Row.Cells[1].FindControl("ChkEdit");
if (ch.Checked == true)
{
ch.Attributes.Add("onclick", "javascript:Del(this);");
}
else
ch.Attributes.Add("onclick", "javascript:BtnAdd_onClick(this);");

I given like that but i wont work

Sun Rays30-Dec-07 22:01

30-Dec-07 22:01

Hey,
u have mistaken..

Not here..
In Javascript write function...

Call only a single function from codebehind...

But make difference in Javascript...

Got it ? Smile | :)

Thanks,
Sun Rays

To get something you must have to try once.

My Articles

SreejithAchutan30-Dec-07 22:13

30-Dec-07 22:13

Is it possible to call 2 javascript function on a checkbox in a grid on onclick event.one is onclick="return Select(this);" .if possible to call another javascript function on the same onclick event..

Working with dynamically created controls

rahul.net1130-Dec-07 21:47

rahul.net11

30-Dec-07 21:47

Hi This could help.

<br />
<br />
function select_deselectAll (chkVal, idVal)<br />
{<br />
  var frm = document.forms[0];<br />
   // Loop through all elements<br />
  for (i=0;i< frm.length; i++)<br />
  {<br />
    // Look for our Header Template's Checkbox<br />
      if (idVal.indexOf ('CheckAll') != -1)<br />
      {<br />
        // Check if main checkbox is checked, then select or deselect datagrid checkboxes<br />
if(chkVal == true)<br />
{<br />
 frm.elements[i].checked = true;<br />
}<br />
else<br />
{<br />
frm.elements[i].checked = false;<br />
}<br />
// Work here with the Item Template's multiple checkboxes<br />
        }<br />
      else if (idVal.indexOf ('DeleteThis') != -1)<br />
      {<br />
    // Check if any of the checkboxes are not checked, and then uncheck top select all checkbox<br />
if (frm.elements[i].checked == false)<br />
{<br />
  frm.elements[1].checked = false;<br />
  //Uncheck main select all checkbox<br />
}<br />
       }<br />
 }<br />
}<br />
function confirmDelete (frm)<br />
{<br />
 // loop through all elements<br />
 for (i=0; i<frm.length; i++)<br="" mode="hold" /> {<br />
   // Look for our checkboxes only<br />
  if (frm.elements[i].name.indexOf("DeleteThis") !=-1)<br />
   {<br />
     // If any are checked then confirm alert, otherwise nothing happens<br />
     if(frm.elements[i].checked)<br />
     {<br />
      return confirm ('Are you sure you want to delete your selection(s)?')<br />
     }<br />
   }<br />
}<br />
}<br />
<br />
<br />
<asp:datagrid id="MyDataGrid" runat="server" width="700" backcolor="white" bordercolor="black"><br />
CellPadding="3" CellSpacing="0" Font-Size="9pt" AutoGenerateColumns="False" HeaderStyle-BackColor="darkred" HeaderStyle-ForeColor="white"><br />
< Columns><br />
< asp:TemplateColumn><br />
< HeaderTemplate><br />
< asp:CheckBox ID="CheckAll" OnCheckedChanged="javascript: return select_deselectAll (this.checked,this.id);" runat="server" /><br />
< font face="Webdings" color="white" size="4">< /font><br />
< /HeaderTemplate><br />
< ItemTemplate><br />
< asp:CheckBox ID="DeleteThis" OnCheckedChanged="javascript: return select_deselectAll (this.checked, this.id);" runat="server" /><br />
< /ItemTemplate><br />
< /asp:TemplateColumn><br />
< asp:TemplateColumn><br />
< HeaderTemplate><br />
ID<br />
< /HeaderTemplate><br />
< ItemTemplate><br />
< asp:Label ID="StoreID" Text='< %# DataBinder.Eval (Container.DataItem, "ID") %>' runat="server"/><br />
< /ItemTemplate><br />
< /asp:TemplateColumn><br />
< asp:BoundColumn HeaderText="Store" Datafield="Store" runat="server" /><br />
< asp:BoundColumn HeaderText="Address" Datafield="Address" runat="server" /><br />
< asp:BoundColumn HeaderText="City" Datafield="City" runat="server" /><br />
< asp:BoundColumn HeaderText="State" Datafield="State" runat="server" /><br />
< asp:BoundColumn HeaderText="Zip" Datafield="Zip" runat="server" /><br />
< /Columns><br />
< /ASP:DataGrid><br />
<br />
<br />
< asp:Button Text="Delete Items" OnClick="DeleteStore" ID="Confirm" runat="server" /><br />
< span id="OutputMsg" runat="server" /><br />
<br />
public void DeleteStore (Object sender, EventArgs e)<br />
{<br />
string dgIDs = "";<br />
bool BxsChkd = false;<br />
foreach (DataGridItem i in MyDataGrid.Items)<br />
{<br />
CheckBox deleteChkBxItem = (CheckBox) i.FindControl ("DeleteThis");<br />
if (deleteChkBxItem.Checked)<br />
{<br />
BxsChkd = true;<br />
// Concatenate DataGrid item with comma for SQL Delete<br />
dgIDs += ((Label) i.FindControl ("StoreID")).Text.ToString() + ",";<br />
}<br />
}<br />
// Set up SQL Delete statement, using LastIndexOf to remove tail comma from string.<br />
string deleteSQL = "DELETE from Stores WHERE stor_id IN (" + dgIDs.Substring (0, dgIDs.LastIndexOf (",")) + ")";<br />
if (BxsChkd == true)<br />
{<br />
// Execute SQL Query only if checkboxes are checked, otherwise error occurs with initial null string<br />
try<br />
{<br />
SqlHelper.ExecuteNonQuery (objConnect, CommandType.Text, deleteSQL);<br />
}<br />
catch (SqlException err)<br />
{<br />
//Exception Catching code as usual displaying message<br />
}<br />
//Refresh data<br />
BindData();<br />
}<br />
}</asp:datagrid>

People Laugh on me Because i am
Different but i Laugh on them
Because they all are same.

Anuradha61230-Dec-07 18:55

Anuradha612

30-Dec-07 18:55

Hi,

I have an appln where in i need to create, text boxes and drop downlists dynamically, the issue here is, how do i retreive the text stored in text box and value selected in the combo.

Thanks in advance

Paul Conrad30-Dec-07 18:58

Paul Conrad

30-Dec-07 18:58

Just like you normally would. Creating the controls dynamically doesn't change how you access the properties.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Anuradha61230-Dec-07 19:05

Anuradha612

30-Dec-07 19:05

but i am unable to refer to the text property for textboxes,

here is how my code goes, to create control

Dim fldMetadata As TextBox
fldMetadata = New TextBox
fldMetadata.ID = "txtID"
Panel1.Controls.Add(fldMetadata)

I refer to the controls like this,

Dim ctrl As Control
For Each ctrl In Panel1.Controls
If ctrl.ID Like "txtID" Then

'Here i should be able to refer to the control's text property

End If
Next

thanks

Paul Conrad30-Dec-07 19:08

Paul Conrad

30-Dec-07 19:08

You then should be able to do ctrl.Text=".... "

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

N a v a n e e t h30-Dec-07 19:10

N a v a n e e t h

30-Dec-07 19:10

Paul Conrad wrote:
You then should be able to do ctrl.Text=".... "

a cast is needed I guess

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Paul Conrad30-Dec-07 19:13

Paul Conrad

30-Dec-07 19:13

N a v a n e e t h wrote:
a cast is needed I guess

Not really. I just tried it and works fine here.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon