gridview disappears after changing the page

gridview disappears after changing the page - c#

I have a gridview that should split into pages but the issue is that when I change the page the whole gridview is disappearing I tried everything I found in the internet but with no solution here is my code
<asp:GridView ID="ExistContents" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None"
AllowPaging="true" PageSize="5" OnPageIndexChanging="ExistContents_PageIndexChanging" >
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:BoundField DataField="ContentID" HeaderText="id" />
<asp:ImageField DataImageUrlField="TmpFilename" HeaderText="Image">
<ControlStyle Height="64px" Width="96px" />
</asp:ImageField>
<asp:BoundField DataField="Name" HeaderText="Name" />
<asp:BoundField DataField="Description" HeaderText="Description" />
<asp:BoundField DataField="Type" HeaderText="Type" />
<asp:BoundField DataField="ContentID" HeaderText="id" Visible="false" ShowHeader="false" />
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:CheckBox runat="server" ID="ChBox1" OnCheckedChanged="ExistContents_CheckedChanged" AutoPostBack="True"/>
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" CssClass="header"/>
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
and here is the event handler
protected void ExistContents_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
ExistContents.PageIndex = e.NewPageIndex;
List<CONTENT> panier;
panier = (List<CONTENT>)Session["PANIER"];
ExistContents.DataSource = panier;
ExistContents.DataBind();
}

You should handle the PageIndexChanged event instead.
The pageIndexChanging is made to give you an option to cancel the paging before it's executed.

here is an answer for this probleme, acctually my datasource was not the session but a linq query so i changed it and it works perfectly
and here is my new code
protected void ExistContents_CheckedChanged(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
GridViewRow gr = (GridViewRow)chk.Parent.Parent.Parent.Parent;
int id= Convert.ToInt32(gr.Cells[0].Text);
if (chk.Checked)
AddToCaddy(id, "DELETE");
else
DeleteFromCaddy(id);
UpdatePanel.DataBind();
UpdatePanel.Update();
}
just for information if you are making a databind to your gridview in the Page_Load inside the if (!IsPostBack) then you will need to redefind the dataSource but if you'r not then you only need to use these functions
UpdatePanel.DataBind();
UpdatePanel.Update();
i hope this helps

Related

Getting selectedrow in RowCommand

i have a gridview as:
<asp:GridView ID="gdvOpinions" runat="server" Width="100%" CellPadding="4"
ForeColor="#333333" GridLines="None" Height="100px" Visible="False"
AutoGenerateColumns="False" onrowcommand="gdvOpinions_RowCommand" >
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:ButtonField ButtonType="Button" CommandName="Confirm" Text="تائید" />
<asp:ButtonField ButtonType="Button" CommandName="Delete" Text="حذف" />
<asp:BoundField DataField="ID" HeaderText="ID" />
<asp:BoundField DataField="مقاله" HeaderText="مقاله" >
<ControlStyle Width="150px" />
</asp:BoundField>
<asp:BoundField DataField="نظر کاربر" HeaderText="نظر کاربر" >
<ControlStyle Width="250px" />
</asp:BoundField>
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
As you see, i have two buttonfield for every row, but when i click one of these buttons and want to get their row in
gdvOpinions_RowCommand
the
gdvOpinions.SelectedRow
returns null;
how should i find which row is selected?

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "false"
OnRowCommand = "OnRowCommand">
<Columns>
<asp:ButtonField CommandName = "ButtonField" DataTextField = "CustomerID"
ButtonType = "Button"/>
</Columns>
</asp:GridView>
protected void OnRowCommand(object sender, GridViewCommandEventArgs e)
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow gvRow = GridView1.Rows[index];
}

From what I understand out of your question, if you are trying to get the row for which the button was clicked, then in that case this might be the right thing to do :
GridViewRow gRow = (GridViewRow)((Control)e.CommandSource).NamingContainer;
Now here, this is for a control such as a Button or ImageButton. You might have to improvise on this for ButtonField.
You can also change the ButtonField to a simple TemplateField with a Button.
Hope this helps.

Adding record to sql with gridview rowcommand buttonfield

I'm trying to add a Register button to every row in my course gridview so that when the user click on the register button on that particular row, it will register him to that particular course on that row by adding a course registration record into sql.
How should I write my code to insert that row's data into sql?
C#:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Register")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = GridView1.Rows[index];
}
ASP.NET:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
OnRowCommand="GridView1_RowCommand" Width="394px">
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" />
<asp:BoundField DataField="Title" HeaderText="Title" ReadOnly="True"></asp:BoundField>
<asp:BoundField DataField="SpeakerName" HeaderText="Speaker" ReadOnly="True" />
<asp:BoundField DataField="startdate" HeaderText="Date" ReadOnly="True" />
<asp:BoundField DataField="Capacity" HeaderText="Capacity" />
<asp:TemplateField HeaderText="Button" ShowHeader="False">
<ItemTemplate>
<asp:Button ID="RegButton" runat="server" CausesValidation="false" CommandName="Register"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" Text="Register" />
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="Select" SelectText="Details" ShowSelectButton="True" />
</Columns>
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<SortedAscendingCellStyle BackColor="#FDF5AC" />
<SortedAscendingHeaderStyle BackColor="#4D0000" />
<SortedDescendingCellStyle BackColor="#FCF6C0" />
<SortedDescendingHeaderStyle BackColor="#820000" />
</asp:GridView>

first you should add course Id (primary key) as datakeynames property to GridView1,and then can get the Id on GridView1_RowCommand like below :
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Register")
{
GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
int courseId = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);
//your other codes
}
so,you have your course Id and by selecting the record you can add current record to sql.hope it helps.
Edit :
also you don't need this part CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" in your aspx page any more

Gridview Command and Selected Row

I am trying to get the selected row data and transfer it to a label on the same page. However I cannot get the Gridview.SelectedRow to work with my CommandName. I have tried everything....
I get the error. Object reference not set to an instance of an object. on Label2.Text
Here is my Code:
protected void GridView1_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple ButtonField column fields are used, use the
// CommandName property to determine which button was clicked.
if (e.CommandName == "Grab")
{
Label2.Text = GridView1.SelectedRow.Cells[2].Text;
Label3.Text = GridView1.SelectedRow.Cells[3].Text;
Label4.Text = GridView1.SelectedRow.Cells[4].Text;
Label5.Text = GridView1.SelectedRow.Cells[5].Text;
}
}
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataKeyNames="ID" DataSourceID="SqlDataSource1" ForeColor="Black" GridLines="Vertical" CssClass="td" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" Width="574px" onrowcommand="GridView1_RowCommand">
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="~/images/edit.png" OnClick="ImageButton2_Click" />
<asp:ImageButton ID="ImageButton1" runat="server" CommandName="Select" ImageUrl="~/images/delete.png" onclientclick=" return confirm('Are you want to Delete this Vehicle?');" />
<asp:ImageButton ID="ImageButton3" runat="server" ImageUrl="~/images/refre.png" CommandName="Grab" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="Year" HeaderText="Year" SortExpression="Year" />
<asp:BoundField DataField="Make" HeaderText="Make" SortExpression="Make" />
<asp:BoundField DataField="Model" HeaderText="Model" SortExpression="Model" />
<asp:BoundField DataField="Submodel" HeaderText="Submodel" SortExpression="Submodel" />
<asp:BoundField DataField="ISENABLED" HeaderText="ISENABLED" SortExpression="ISENABLED" />
</Columns>
<FooterStyle BackColor="#CCCC99" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<RowStyle BackColor="#F7F7DE" />
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#FBFBF2" />
<SortedAscendingHeaderStyle BackColor="#848384" />
<SortedDescendingCellStyle BackColor="#EAEAD3" />
<SortedDescendingHeaderStyle BackColor="#575357" />
</asp:GridView>

Try something like this. Since you're trying to access the values in the command event and not in the OnSelectedIndexChanged event you need to get hold of the row triggering the command event first.
if (e.CommandName == "Grab")
{
GridViewRow row = (GridViewRow)((ImageButton)e.CommandSource).NamingContainer;
if (row != null)
{
Label2.Text = row.Cells[2].Text;
Label3.Text = row.Cells[3].Text;
Label4.Text = row.Cells[4].Text;
Label5.Text = row.Cells[5].Text;
}
}

Dynamically adding drop down lists inside gridview cells

I have a grid view, if the database is returning null for a particular column I want to insert a drop down list that is populated from a database.
Here is the code I have to identify the the column is null and it is working correctly.
protected void viewThemeTypeAssociationsGridView_OnRowDataBound(Object sender, GridViewRowEventArgs e)
{
if (e.Row.Cells[1].Text == " ")
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//fill current rows cell with a dropdown list
}
}
Here is the gridview:
<asp:GridView ID="viewThemeTypeAssociationsGridView" runat="server"
AutoGenerateColumns="False" BackColor="#DEBA84" BorderColor="#DEBA84"
BorderStyle="None" BorderWidth="1px" CellPadding="3" CellSpacing="2"
DataSourceID="SqlDataSource6" OnRowDataBound="viewThemeTypeAssociationsGridView_OnRowDataBound">
<Columns>
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Type" HeaderText="Type" SortExpression="Type" />
</Columns>
<FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
<HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
<PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
<RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
<SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#FFF1D4" />
<SortedAscendingHeaderStyle BackColor="#B95C30" />
<SortedDescendingCellStyle BackColor="#F1E5CE" />
<SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource6" runat="server"
ConnectionString="<%$ ConnectionStrings:ApplicationServices %>" >
</asp:SqlDataSource>
Additionally, once I populate the row, how do I know which drop down list specifically is being used when there are many versions of it?

Design
<asp:GridView ID="viewThemeTypeAssociationsGridView" runat="server" AutoGenerateColumns="False"
BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px"
CellPadding="3" CellSpacing="2"
OnRowDataBound="viewThemeTypeAssociationsGridView_RowDataBound"
DataSourceID="Sql_New" >
<Columns>
<asp:BoundField DataField="id" HeaderText="id" SortExpression="id"
InsertVisible="False" ReadOnly="True" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Type" HeaderText="Type" SortExpression="Type" />
<asp:TemplateField HeaderText ="New Column" >
<ItemTemplate >
<asp:DropDownList ID="ddlnew" runat ="server" Visible ="false" ></asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
<HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
<PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
<RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
<SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#FFF1D4" />
<SortedAscendingHeaderStyle BackColor="#B95C30" />
<SortedDescendingCellStyle BackColor="#F1E5CE" />
<SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>
<asp:SqlDataSource ID="Sql_New" runat="server"
ConnectionString="<%$ ConnectionStrings:EmployeeConnectionString %>"
SelectCommand="SELECT * FROM [tblnew]"></asp:SqlDataSource>
Code
protected void viewThemeTypeAssociationsGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.Cells[2].Text == " ")
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddlnew = (DropDownList)e.Row.FindControl("ddlnew");
ddlnew.Visible = true;
}
}
}

How do I hide my primary key from GridView but still reference it

I have a GridView that is built from a Linq query as follows
var GridViewLoad = from d in QVuser.QlikViewDashboards.AsEnumerable()
join p in tempPermissions.AsEnumerable() on d.DashboardId equals Convert.ToInt32(p["DashboardId"])
where Convert.ToInt32(p["UserId"]) == GridViewUser
select new
{
DashboardId = d.DashboardId,
PermissionId = Convert.ToInt32(p["PermissionId"]),
DashboardName = d.DashboardName,
Operational_Unit = p["Operational_Unit"].ToString(),
Cost_Centre = p["Cost_Centre"].ToString(),
Project = p["Project"].ToString(),
Fund = p["Fund"].ToString()
};
GridView1.DataSource = GridViewLoad;
GridView1.DataKeyNames = new string[] {"PermissionId"};
GridView1.DataBind();
Then the GridView is defined as:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="3"
GridLines="Vertical" ShowHeaderWhenEmpty="True" OnRowDeleting="GridView1_RowDeleting"
style="text-align: center" BackColor="White" BorderColor="#999999"
BorderStyle="None" BorderWidth="1px" Width="550px"
>
<AlternatingRowStyle BackColor="#DCDCDC" />
<Columns>
<asp:TemplateField HeaderText="Delete" ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="DeleteButton" runat="server" CausesValidation="false"
CommandArgument='<%# Eval("PermissionId") %>' CommandName="Delete" Text="Delete"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="PermissionId" HeaderText="ID"/>
<asp:BoundField DataField="DashboardName" HeaderText="Dashboard" ReadOnly="True" SortExpression="DashboardName" />
<asp:BoundField DataField="Operational_Unit" HeaderText="Operational_Unit" ReadOnly="True" SortExpression="Operational_Unit" />
<asp:BoundField DataField="Cost_Centre" HeaderText="Cost_Centre" ReadOnly="True" SortExpression="Cost_Centre" />
<asp:BoundField DataField="Fund" HeaderText="Fund" ReadOnly="True" SortExpression="Fund" />
<asp:BoundField DataField="Project" HeaderText="Project" ReadOnly="True" SortExpression="Project" />
</Columns>
<FooterStyle BackColor="#CCCCCC" ForeColor="Black" BorderStyle="Solid" />
<HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
<RowStyle BackColor="#EEEEEE" ForeColor="Black" BorderStyle="Solid"
BorderWidth="1px" />
<SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F1F1F1" />
<SortedAscendingHeaderStyle BackColor="#0000A9" />
<SortedDescendingCellStyle BackColor="#CAC9C9" />
<SortedDescendingHeaderStyle BackColor="#000065" />
What I want to do is hide the PermissionId field from sight, but it obviously still needs to be there for the Delete button to work..
Can someone help me out with this?
I've tried setting Visible="false", which hides it, but then my delete button stops working..
Cheers for your help..

Since you're setting the DataKeyNames, you should be able to retrieve the permission ID from the index of the row being deleted, like so:
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
int permissionId = (int)GridView1.DataKeys[e.RowIndex].Value;
DoDelete(permissionId);
}
This should work whether the column is visible or not.

Try
<asp:BoundField DataField="PermissionId" HeaderText="ID" Visible="False"/>

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

gridview disappears after changing the page - c#

You should handle the PageIndexChanged event instead. The pageIndexChanging is made to give you an option to cancel the paging before it's executed.

Related

Getting selectedrow in RowCommand

Adding record to sql with gridview rowcommand buttonfield

Gridview Command and Selected Row

Dynamically adding drop down lists inside gridview cells

How do I hide my primary key from GridView but still reference it

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