Develop Reference

How to work with DataBinder.Eval in GridView?

I have a GridView contains Lables, I need to show/hide Lables based on data.
Here is my GridView:
<asp:GridView ID="GridView_Profiles" runat="server" CssClass="grid" HorizontalAlign="Center"
OnRowDataBound="GridView_Profiles_OnRowDataBound" CellSpacing="1" GridLines="None"
AutoGenerateColumns="False" Width="90%">
<Columns>
<asp:Label ID="Label_SelectedCount" runat="server">
<span style="width:auto;color:White;background-color:#0c95be;height:auto;margin:0px;font-size:12px;cursor:pointer;padding-left:10px;padding-right:10px;padding-top:5px;padding-bottom:5px;">
<%#Eval("Count") %>
</span>
</asp:Label>
<asp:Label ID="lblNoCount" runat="server" Text="-"></asp:Label>
</Columns>
</asp:GridView>
In the above GridView RowDataBound how should I check for the bounding data using DataBinder.Eval?

Use this to get Label in RowDataBound event with DataBinder.Eval:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
// find your label text in gridview with DataBinder.Eval
string count = DataBinder.Eval(e.Row.DataItem, "Count") as string;
// find your label control in gridview
Label lb = (Label)e.Row.FindControl("Label_SelectedCount");
// check condition to show/hide label (you use your own condition)
if(count > 0)
lb.Visible = true;
else
lb.Visible = false;
}
}
Or you can bind GridView with DataBinder.Eval like:
<asp:TemplateField HeaderText="Count"
<ItemTemplate>
<asp:Label ID="Label_SelectedCount" runat="server" >
<%# DataBinder.Eval(Container.DataItem, "Count")%>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
Note: You can also bind data to Label's Text attribute like this Text='<%#Eval("Count") %>'.

How to disable particular commandfield in a gridview?

I have a gridview with a label and a commandfield for edit.
I want to disable the commandfield if the label contains today's date.
All commandfields of empty labels should be enabled.
How can I achieve that?
Thanks
Aspx -
<asp:GridView ID="gv" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField HeaderText="Schedule Date">
<ItemTemplate>
<asp:Label ID="schedule" runat="server" Text='<%# Eval("Date","{0:dd-MMM-yy}") %>'></asp:Label>
</ItemTemplate>
<asp:CommandField ShowEditButton="true" EditText="Click here to Schedule/Re-Schedule" UpdateText="Submit" HeaderText="Schedule/Re-Schedule" />
</Columns>
</asp:GridView>

its better if you use command field as linkButton:
<asp:GridView ID="gv" runat="server" AutoGenerateColumns="False"
onrowdatabound="gv_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Schedule Date">
<ItemTemplate>
<asp:Label ID="schedule" runat="server" Text='10:25-02-2015'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
CommandName="Edit" Text="Edit"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
then you can use row data bound event:
protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Label schedule = (Label)e.Row.FindControl("schedule");
LinkButton LinkButton1 = (LinkButton)e.Row.FindControl("LinkButton1");
if (schedule.Text == string.Empty)
{
LinkButton1.Enabled = false;
}
else
{
LinkButton1.Enabled = true;
}
}
}
This will help you!

How to add conditional button in template field gridview?

I have one gridview that contains some fields, I want to show button in TemplateField when Process field has value.
Here is my code:
<asp:GridView ID="grdList" PageSize="20" runat="server" DataSourceID="ODList" AllowPaging="True"
AllowSorting="True" PagerSettings-Position="Top" AutoGenerateColumns="False"
ShowFooter="True" ShowHeaderWhenEmpty="True" OnPageIndexChanged="grdList_PageIndexChanged">
<Columns>
<asp:BoundField DataField="MeasureCatalogId" SortExpression="MeasureCatalogId" />
<asp:BoundField DataField="MeasureName" SortExpression="MeasureName" />
<asp:TemplateField SortExpression="Process">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("Process") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("LevelId") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<%if(????????) -- want condition for process!= ""
{
%>
<img class="semPopup" sempopupurl='<%=Constant.AppPath %>/forms/baseform/MeasureProcessFromCatalogForm.aspx?t=2&lid=<%# Eval("LevelId") %>&mid=<%# Eval("MeasureCatalogId") %>'
sempopupwidth="<%=width %>" sempopupheight="<%=height %>"
src="../../App_Themes/images/select2.gif" />
<%} %>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<PagerSettings Position="Top"></PagerSettings>
<PagerStyle CssClass="grid_pager" />
</asp:GridView>

As an alternative to the other recommendations; you could try using a code expression on the field:
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<img class="semPopup" sempopupurl='<%=Constant.AppPath %>/forms/baseform/MeasureProcessFromCatalogForm.aspx?t=2&lid=<%# Eval("LevelId") %>&mid=<%# Eval("MeasureCatalogId") %>'
sempopupwidth="<%=width %>" sempopupheight="<%=height %>"
src="../../App_Themes/images/select2.gif" Visible='<%# ShowButton(Eval("Process")) %>'/>
</ItemTemplate>
</asp:TemplateField>
I have not tried this out, but it follows a similar pattern to what i have previously used. The code expression calls the codebehind function 'ShowButton' which should return a bool, here you can evaluate the value of process passed in, and if it is to your liking, pass back a true value; otherwise return false and the button will not show.
C#
protected bool ShowButton(object DataItem)
{
//Here you can place as many conditions as you like
//Provided you always return either true or false
if (DataItem != null)
return true;
else
return false;
}
A suggested edit was posed in a similar fashion, however instead of a bool visibility, the visibility setting is altered by string value. I am sure they will add their take too. After all, variety is the spice of life

Use codebehind, make the button visible when appropriate:
protected void gridview1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRow row = ((DataRowView)e.Row.DataItem).Row;
string process = row.Field<string>("Process"); // change type from string to whatever it is
Button btn = (Button) e.Row.FindControl("ButtonID");
btn.Visible = process == "YourProcessValue";
}
}

you can make use of RowDataBoundand than make decision of hiding your control
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
SomeObject mapItem = (SomeObject)e.Row.DataItem;
if(!mapItem.Process)
(e.Row.Cells[3].FindControl("Buttonid") as Button).visible= false;
}
}
or try
<ItemTemplate>
<asp:Button runat="server" Text="Reject"
Visible='<%# ((bool)Eval("Process")) %>' />
</ItemTemplate>

Create hyperlink button cells in gridview using C# asp.net

I am having a GridView in my web page. Which is displaying the data with the columns as Status, Name , Id and Action. My status column always filled with the 3 values(Complete, Queued and Failed) randomly.
Now I want to display this status column values as a link ,If it is having the value either "Failed" or "Queued". But "Complete" status should not be display as a link.
How Can I achive this design during the runtime?
My Code for binding the data into the grid is,
protected void Page_Load(object sender, EventArgs e)
{
DataTable dtActionList = clsactionList.GetADActionList();
grdADActionList.DataSource = dtActionList;
grdADActionList.DataBind();
}
protected void grdADActionList_RowDataBound(object sender, GridViewRowEventArgs e)
{
foreach (GridViewRow gvr in grdADActionList.Rows)
{
if ((gvr.FindControl("Label1") as Label).Text == "Completed")
{
(gvr.FindControl("Label1") as Label).Visible = true;
(gvr.FindControl("HyperLink1") as HyperLink).Visible = false;
}
}
}
using this code I am just simply binding the values in the grid. I am not able to create the Status column as having link buttons based on the binded values for that status column.
My .aspx Code is:
<asp:GridView ID="grdADActionList" runat="server" Height="83px" Width="935px" AutoGenerateColumns="false" OnRowDataBound="grdADActionList_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Status" SortExpression="Status">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='http://localhost:52807/Default.aspx?'><%# Eval("Status") %>
</asp:HyperLink>
<asp:Label ID="Label1" runat="server" Text="<%# Container.DataItem %>" Visible="False"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="GivenName" HeaderText="GivenName"/>
Please help me to do this further....

On GridViewDataBound event, just hide the link and display a simple label if the value is complete.
ASP.NET:
<asp:TemplateField HeaderText="Status" SortExpression="Status">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='your_url'>
<%# Eval("Status") %>
</asp:HyperLink>
<asp:Label ID="Label1" runat="server" Text="<%# Eval("Status") %>" Visible="False"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
C#:
protected void onGridViewDataBound()
{
foreach(GridViewRow gvr in grd)
if((gvr.FindControl("Label1") as Label).Text.ToLower() == "complete") // Updated Line
{
(gvr.FindControl("Label1") as Label).Visible = true;
(gvr.FindControl("HyperLink1") as HyperLink).Visible = false;
}
}

you have to work in design file means .aspx file
you have to use and
<asp:GridView ID="GridView1" runat="server" EnableModelValidation="True">
<asp:TemplateField HeaderText="Hyperlink">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl='<%# Eval("CODE", #"http://localhost/Test.aspx?code={0}") %>'
Text='link to code'>
</asp:HyperLink>
</ItemTemplate>

You can place an handler on RowDataBound event
protected void gw_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRowView v_DataRowView = (DataRowView)e.Row.DataItem;
string NavigateUrl = <....place your link here with DataRowView info>
e.Row.Attributes.Add("onclick", NavigateUrl);
}
}

For now you have your columns auto generated, so first disable that feature. Then you need to define each column as a BoundField, and for the hypelink, taking into account your condition, the best way is to define template field:
<asp:GridView ID="grdADActionList" runat="server" BorderStyle="Double" BorderWidth="3px"
Height="83px" Width="935px"
AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="Name" HeaderText="Name"/>
<asp:BoundField DataField="Action" HeaderText="Action"/>
<asp:BoundField DataField="Id" HeaderText="Id"/>
<asp:TemplateField HeaderText="Status">
<ItemTemplate>
<asp:HyperLink runat="server" NavigateUrl="~/link/address" Text='<%# Eval("Status") %>'
Visible='<%# (int)Eval("Status") != 1 %>'/>
<asp:Label runat="server" Text='<%# Eval("Status") %>'
Visible='<%# (int)Eval("Status") == 1 %>'>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Note that this is just a variation - you have not specified what values does Status column contain, so I assumed this is int-based enumeration.

How to reference a linkbutton thats inside a asp:grid when its clicked

I have a ASP:grid which has a link button, i need to some how reference that on the code behind when its clicked but im struggling on the syntax
Heres my ASP:Grid i need to execute code in the code behind when that link button 'Re-Take' is pressed and also be able to know what row it was clicked on as i will need to reference the users emails and name and then send an email with the relevant information....
<asp:GridView ID="GrdViewUsers" runat="server" AutoGenerateColumns="false" GridLines="None"
EnableViewState="false" class="tablesorter">
<AlternatingRowStyle></AlternatingRowStyle>
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton Text="Re-Take" runat="server" ID="Edit" CommandName="Edit"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Full Name">
<ItemTemplate>
<asp:HyperLink ID="HyperFullName" CssClass="gvItem" runat="server" NavigateUrl='<%#Eval("UserID","/ExamPaper.aspx?uid={0}") %>'
Text='<%# DataBinder.Eval(Container,"DataItem.FullName") %>'></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Email">
<ItemTemplate>
<asp:Label ID="lblSurname" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Email") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Exam Taken">
<ItemTemplate>
<asp:Label ID="lblUsername" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.ExamTaken") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date Taken">
<ItemTemplate>
<asp:Label ID="lblUsername" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.DateTaken") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Exam Total">
<ItemTemplate>
<asp:Label ID="lblUsername" CssClass="gvItem" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.ExamTotal") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
If someone can help me with a snippet i would highly appreciate it

You could approach this slightly different. You see, when a control is placed inside a gridview, any event raised from that control raises also the RowCommand on the GridView.
To get what you want you could then add both CommandName and CommandArgument to your LinkButton and then catch it in the GridView's RowCommand.
<asp:LinkButton id="LinkButton1" runat="server" commandName="LinkButtonClicked" commandArgument='Eval("myObjectID")' />
where myObjectID is the name of the ID column of your object you bind the grid to.
Then
void GridView1_RowCommand( object sender, GridViewCommandEventArgs e )
{
if ( e.CommandName == "LinkButtonClicked" )
{
string id = e.CommandArgument; // this is the ID of the clicked item
}
}
see: ASP.net GridView: get LinkItem's row

FindControl should work in this case.
protected void GrdViewUsers_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
HyperLink myHyperLink = e.Row.FindControl("Edit") as HyperLink;
}
}

First: You have repeating ID's in your TemplateFields like lblUsername what is not allowed since it's the same NamingContainer.
You can pass the RowIndex as CommandArgument to RowCommand:
on aspx:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton
Text="Re-Take"
runat="server"
ID="Edit"
CommandName="Edit"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
Handle the GridView's RowCommand:
void GrdViewUsers_RowCommand(Object sender, GridViewCommandEventArgs e)
{
if(e.CommandName=="Edit")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = GrdViewUsers.Rows[index];
// now you can get all of your controls like:
Label lblSurname = (Label)row.FindControl("lblSurname");
String email = lblSurname.Text // you noticed that DataItem.Email is bound to lblSurname?
}
}

Suppose the grid has linkbutton on which we want to get row index
<asp:LinkButton ID="lnkbtnAdd " runat="server" CommandName="cmdAdd" ImageUrl="~/Images/add.gif" ></asp:LinkButton>
In code behind, In OnRowCreated event we attach row number of grid to each button of row to get it back when it is clicked in RowCommand event
protected void gvListing_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
System.Web.UI.WebControls.LinkButton lnkbtnAdd = new System.Web.UI.WebControls.LinkButton();
lnkbtnAdd = (System.Web.UI.WebControls.LinkButton)e.Row.FindControl("lnkbtnAdd");
if (lnkbtnAdd != null)
lnkbtnAdd .CommandArgument = e.Row.RowIndex.ToString();
}
}
In RowCommand event we will get back the current row index and set the selected index of the grid
protected void gvListing_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.ToString() == "cmdAdd")
{
int RowIndex = int.Parse(e.CommandArgument.ToString());// Current row
}
}