Develop Reference

assign a value to checkbox in a grid header

I have following grid
<asp:GridView ID="grdDWlocations" CssClass="table table-hover table-striped" runat="server" GridLines="None" ShowHeaderWhenEmpty="True"
EmptyDataText="No data found..." AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="" Visible="true">
<HeaderTemplate>
<asp:CheckBox ID="allDWlocchk" runat="server" Checked="true" Width="10px" onclick="CheckAllgrdReqDW(this)"></asp:CheckBox>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chk_DWlocReq" runat="server" Checked="true" Width="5px" OnCheckedChanged="chk_Req_CheckedChangedDW_Click" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Code">
<ItemTemplate>
<asp:Label ID="lbl_DWCode" runat="server" Text='<%# Bind("Ml_loc_cd") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<asp:Label ID="lbl_DWDescription" runat="server" Text='<%# Bind("Ml_loc_desc") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I want to assign a value for 'allDWlocchk' which is header check,
how can I do this in code behind
I tried this none of the thing worked
Attempt 1 :
((CheckBox)(grdDWlocations).FindControl("allDWlocchk")).Checked = false;
Attempt 2 :
((CheckBox).FindControl("allDWlocchk")).Checked = false;

You are on the right track, FindControl is the way to go here. But the problem is that it only works with direct children. So instead of searching on the Page or on the GridView you need to be searching in the header row. Which is available as the GridView property. So:
GridViewRow headerRow = grdDWlocations.HeaderRow;
((CheckBox)headerRow.FindControl("allDWlocchk")).Checked = false;

Set custom NavigateUrl value from gridview c#

I have a gridview in which I want to load a users details. In this gridview I want to make the users phone number a hyperlink. This is so they can click on the link and it automatically rings the number using the phone software stored on the their pc. This works fine if you use the below syntax in html:
07123456789
My issue is that I want to do this in a gridview which populattes the phone number. The html has to have the 'tel:' bit in front of it first. I have tried everything please help! I want essentially above but to render in gridview with the loaded HomeNo where the phone number should be...HElp!
Gridview:
<asp:GridView ID="GridView1" runat="server" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" AllowPaging="True" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="ds">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
<asp:HyperLinkField DataTextField="HomeNo" HeaderText="HomeNo" NavigateUrl="tel:" />
</Columns>
</asp:GridView>

<asp:GridView ID="GridView1" runat="server" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" AllowPaging="True" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="ds">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
<asp:TemplateField>
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl='<%# Eval("HomeNo", "tel:{0}") %>'
Text='<%# Eval("NomeNo") %>'></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

you would need to do this inside of an also if you have data it's reading from you need to do some code inside of the DataBound Event of the DataGrid
for example I have names and email addresses as a link in my current datagrid here is how I do it
<asp:TemplateColumn HeaderText="Scheduler" HeaderStyle-Font-Bold="true" HeaderStyle-Width="145">
<ItemTemplate>
<a href='<%#Eval("Email_Address") %>' ><%# Eval("Scheduler") %></a>
</ItemTemplate>
<HeaderStyle Font-Bold="True" />
</asp:TemplateColumn>
protected void dgShippers_DataBinding(object sender, EventArgs e)
{
foreach (DataRow r in dtShippers.Rows)
{
if (!System.Uri.IsWellFormedUriString(r.ItemArray[3].ToString(), UriKind.Absolute))
{
var tempHref = "<a href=mailto:" + r.ItemArray[4].ToString() + " />" + r.ItemArray[3].ToString()+ "</a>";
r.Table.Rows[0]["Scheduler"] = tempHref;
}
}
}

Selection of checkboxes lost during pagination of gridview

I have a problem in gridview, as per requirement i have set No of Records per page = 4 in gridview. I have to select Checkbox against every complaint but problem is then when i got to next pge in gridview and e.g fro 1 to 2 then when i come back to page 1 then it doesn't show TICK in check boxes . It doesn't remember my selection when i browse to and back to page.
<asp:GridView ID="GridViewSmsComplaints" AllowPaging="True" PageSize="4" runat="server" AutoGenerateColumns="False" CssClass="mGrid" BorderColor="#333333" Width="550px" OnPageIndexChanging="GridViewSmsComplaints_PageIndexChanging" >
<Columns>
<asp:BoundField HeaderText="ID" DataField="ID" />
<asp:BoundField HeaderText="Recieving Date" DataField="RecievingDate" />
<%--<asp:BoundField HeaderText="ToMobileNo" DataField="ToMobileNo" /> --%>
<asp:BoundField HeaderText="FromMobileNo" DataField="FromMobileNo" />
<asp:BoundField HeaderText="Message" DataField="Message" >
<ItemStyle Wrap="True" />
</asp:BoundField>
<asp:TemplateField HeaderText="IsComplaint">
<ItemTemplate>
<asp:CheckBox ID="ckboxIsComplaint" runat="server" Checked='<%# Convert.ToBoolean(Eval("IsComplaint").ToString()) %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

please check the above link.here your problem was clearly explained here.i think so it may be helpfull

As per comments...
If you do not update the underlying database by processing the OnCheckChanged event of the check box, then it will simply be reading the same data all the time.
From How to add event for Checkbox click in Asp.net Gridview Column, I have extracted the required information and tried to modify to fit your initial question.
<asp:TemplateField HeaderText="IsComplaint">
<ItemTemplate>
<asp:CheckBox ID="ckboxIsComplaint" runat="server" Checked='<%# Convert.ToBoolean(Eval("IsComplaint").ToString()) %>' OnCheckedChanged="chk_CheckedChanged" AutoPostBack="true/>
</ItemTemplate>
</asp:TemplateField>
add checkbox change event in aspx.cs page
protected void chk_CheckedChanged(object sender, EventArgs e)
{
GridViewRow row = ((GridViewRow)((CheckBox)sender).NamingContainer);
<your data source>.Rows[row.DataItemIndex]["B"] = ((CheckBox)GridViewSmsComplaints.Rows[row.RowIndex].FindControl("ckboxIsComplaint")).Checked;
}

GridView Sorting is not working

Merged with GridView sorting works once only.
Please help me, I set Allowsorting="true" but sorting is not working in my GridView. I want automatic sorting i.e. sorting without handling its event.
Here is code of aspx page:
<asp:GridView ID="gdvSignatureLines" runat="server" CssClass="Grid1" AutoGenerateColumns="False"
SkinID="PagedGridView" AllowPaging="True" AllowSorting="True" DataKeyNames="Id"
onrowcommand="gdvSignatureLines_RowCommand"
onrowdeleting="gdvSignatureLines_RowDeleting"
onrowediting="gdvSignatureLines_RowEditing">
<PagerStyle CssClass="gridPager" HorizontalAlign="Right" />
<Columns>
<ucc:commandfieldcontrol headertext="Actions" showdeletebutton="true" buttontype="Image"
deleteimageurl="~/App_Themes/Default/images/delete.png" showeditbutton="true"
editimageurl="~/App_Themes/Default/images/edit.png" deleteconfirmationtext="Are you sure you want to delete?">
<ItemStyle HorizontalAlign="Center" Width="60px" />
</ucc:commandfieldcontrol>
<asp:BoundField DataField="SortOrder" HeaderText="Line" SortExpression="SortOrder" />
<asp:TemplateField HeaderText="Type">
<ItemTemplate>
<asp:Label ID="lblglTypeId" runat="server" Text='<%# Eval("GeneralLookup.LookupItem") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Label">
<ItemTemplate>
<asp:Label ID="lblglLabelId" runat="server" Text='<%# Eval("GeneralLookup1.LookupItem") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Caption" HeaderText="Caption" SortExpression="Caption" />
</Columns>
<EmptyDataTemplate>
<div class="divEmptyListingGrid">
--- No Signature Line Exists ---
</div>
</EmptyDataTemplate>
</asp:GridView>
Here is the code of CS file:
protected void LoadSignatureList(int reportId, string reportName)
{
lblHeading.Text = "Signature Line for " + reportName;
ReportOptionsBO reportOptionsBO = new ReportOptionsBO();
this.gdvSignatureLines.DataSource = reportOptionsBO.GetReportSignatureLineByReportId(reportId);
this.gdvSignatureLines.DataBind();
}
When I click on the Header of column "Line" or "Caption", nothing happens.
I have one more grid that is working fine. The difference between both is, data is bound to this grid on runtime. But the other grid's datasource is preset.
My current grid has not these options of Enable Paging and Enable Sorting.
Please help as soon as possible.

Gridview OnRowCreated event gets triggered multiple times - dropdownlist gets populated twice

Attaching the code below - its a simple code that just initializes the dropdown (calling ddl.Clear()) and adds an item with text "select" which has value "-1".
Filldropdowns(ddl) are methods that get specific data and populate it into the dropdown method. The methods individually work fine outside the gridview on normal dropdownlists.
What happens is this eventhandler gets called more than once for each gridview row. As an end result, the dropdowns contain double the values they are supposed to contain (the complete set of values just get repeated).
Anyone knows why this is happening? Turning off appenddatabounditems is not an option because i need the items to be appended below the "select".
Strange thing is, when I debug, even on the second time call for the same row, it shows that the dropdownvalues contain zero items and then contains the required number of items. But by the time I reach grdAccountsMapping_DataBound() handler, it shows twice the number of items.
public void grdAccountsMapping_RowCreated(object sender, GridViewRowEventArgs e)
{
GridViewRow row = e.Row;
if (row.RowType == DataControlRowType.DataRow)
{
DropDownList ddlGrdFeeFormat = (DropDownList)row.FindControl("ddlFeeFormat");
DropDownList ddlGrdTransactionMode = (DropDownList)row.FindControl("ddlTransactionMode");
DropDownList ddlGrdFeeParticular = (DropDownList)row.FindControl("ddlFeeParticular");
DropDownList ddlGrdCompany = (DropDownList)row.FindControl("ddlCompany");
DropDownList ddlGrdAccounts = (DropDownList)row.FindControl("ddlAccounts");
DropDownList ddlGrdFeeBook = (DropDownList)row.FindControl("ddlFeeBook");
InitializeDropdown(ddlGrdFeeBook);
InitializeDropdown(ddlGrdFeeFormat);
InitializeDropdown(ddlGrdTransactionMode);
InitializeDropdown(ddlGrdFeeParticular);
InitializeDropdown(ddlGrdCompany);
getDDLValues.FillFeeBooks(ddlGrdFeeBook);
getDDLValues.FillFeeFormats(ddlGrdFeeFormat);
getDDLValues.FillPaymentModes(ddlGrdTransactionMode);
getDDLValues.FillFeeParticulars(ddlGrdFeeParticular);
getDDLValues.FillAccountingCompanies(ddlGrdCompany);
}
}
The aspx page grid definition looks like this
<asp:GridView CssClass="Grid" ID="grdAccountsMapping" runat="server" Width="98%"
EmptyDataText="No records found in this section" EmptyDataRowStyle-Height="40px"
AutoGenerateColumns="False" AccessKey="2" DataKeyNames="FAM_MAP_ID" OnRowCommand="grdAccountsMapping_RowCommand"
OnRowCreated="grdAccountsMapping_RowCreated" OnDataBound="grdAccountsMapping_DataBound"
Visible="false">
<AlternatingRowStyle CssClass="alternateGridItem" HorizontalAlign="Left" />
<RowStyle CssClass="gridItem" HorizontalAlign="Left" />
<EmptyDataRowStyle CssClass="gridItem" HorizontalAlign="Center" Font-Bold="True"
ForeColor="Red" Height="40px" VerticalAlign="Middle" />
<HeaderStyle CssClass="tabledarklabel" />
<FooterStyle CssClass="Grid_Footer" />
<Columns>
<asp:TemplateField HeaderText="Fee Book">
<ItemTemplate>
<asp:DropDownList ID="ddlGrdFeeBook" CssClass="dropdownwidth3" runat="server" AppendDataBoundItems="True">
</asp:DropDownList>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
<HeaderStyle Width="5%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Fee Format">
<ItemTemplate>
<asp:DropDownList ID="ddlGrdFeeFormat" CssClass="dropdownwidth3" runat="server" AppendDataBoundItems="True">
</asp:DropDownList>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
<HeaderStyle Width="5%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Transaction Mode">
<ItemTemplate>
<asp:DropDownList ID="ddlGrdTransactionMode" CssClass="dropdownwidth3" runat="server"
AppendDataBoundItems="True" >
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Fee Particulars">
<ItemTemplate>
<asp:DropDownList ID="ddlGrdFeeParticular" CssClass="dropdownwidth3" runat="server"
AppendDataBoundItems="True">
</asp:DropDownList>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
<HeaderStyle Width="5%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Company">
<ItemTemplate>
<asp:DropDownList ID="ddlGrdCompany" CssClass="dropdownwidth3" runat="server" AppendDataBoundItems="True">
</asp:DropDownList>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
<HeaderStyle Width="5%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Account">
<ItemTemplate>
<asp:DropDownList ID="ddlGrdAccounts" CssClass="dropdownwidth3" runat="server" AppendDataBoundItems="True">
</asp:DropDownList>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
<HeaderStyle Width="5%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Active">
<ItemTemplate>
<asp:CheckBox ID="chkActive" runat="server" />
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
<HeaderStyle Width="5%" />
</asp:TemplateField>
</Columns>
<PagerSettings Visible="False" />
<PagerStyle BorderStyle="None" />
</asp:GridView>
The other methods used just retrieve a dataset for the data needed, assign it to the datasourceo of the dropdown and then bind it to the dropdownlist control. Those methods work fine on dropdowns outside the grid, and I have unit tested them - so I am sure the problem is not there.

How are you binding the grid? Are you calling DataBind() and/or Rebind() multiple times by accident?

We just deleted the file and created it again and it seemed to work. I din't have much time to dig into the details since we were on a deadline, but that wierd issue has not happened again!