Paging GridView Issues - asp.net

Question

I just read some articles about paging gridview but I couldn't make it...
There is my full gridview's code:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" style="font-family: Verdana, Arial, Sans-Serif;"
CssClass="gridview" OnSorting="GridView_Sorting"
DataKeyNames="id"
AllowSorting ="True" BackColor="#CCCCCC"
BorderStyle="Inset" BorderWidth="2px" BorderColor="GrayText"
CellPadding="1"
CellSpacing="5"
HeaderStyle-HorizontalAlign="Center"
OnRowDataBound="GridView1_RowDataBound"
ForeColor = "Black" RowStyle-CssClass="gridview"
OnRowCommand="GridView1_RowCommand" AllowPaging="True"
OnPageIndexChanging="GridView1_PageIndexChanging" PageSize="5">
<AlternatingRowStyle BackColor="#CCCCCC" />
<columns>
<asp:BoundField HeaderText="ID" DataField="id" />
<asp:BoundField HeaderText="PRIORIDADE" DataField="prioridade"
ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="SITUAÇÃO" DataField="situacao" ItemStyle-HorizontalAlign="Center" >
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="RESPONSAVEL" DataField="responsavel" HeaderStyle-Width="65px" ItemStyle-HorizontalAlign="Center">
<HeaderStyle Width="65px" />
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="DATA DE CADASTRO" DataField="dt_cadastro" DataFormatString="{0:dd/MM/yyyy}" HeaderStyle-Width="60px" SortExpression="dt_cadastro"
ItemStyle-HorizontalAlign="Center" >
<HeaderStyle Width="60px" />
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="PREVISÃO DE TÉRMINO" DataField="previsao_termino" DataFormatString="{0:dd/MM/yyyy}" HeaderStyle-Width="60px"
ItemStyle-HorizontalAlign="Center">
<HeaderStyle Width="60px" />
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="PROJETO" DataField="projeto" ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="FUNCIONALIDADE" DataField="funcionalidade"
ItemStyle-HorizontalAlign="Center" >
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField HeaderText="CLUBE" DataField="clube"
ItemStyle-HorizontalAlign="Center" >
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:TemplateField HeaderStyle-Width="70px" HeaderText="VISUALIZAR" >
<ItemTemplate>
<asp:Button ID="Btn_Visualizar" runat="server" Text="VISUALIZAR" CssClass="Btn_Grid" Font-Size="7pt" Font-Names="Verdana, Arial" OnClick="Btn_Visualizar_Click"
CommandName="visualizar" CommandArgument="<%# ((GridViewRow)Container).RowIndex %>" />
</ItemTemplate>
<HeaderStyle Width="70px" />
</asp:TemplateField>
<asp:TemplateField HeaderStyle-Width="66px" HeaderText="ALTERAR">
<ItemTemplate>
<asp:Button ID="Btn_Alterar" runat="server" Text="ALTERAR" CssClass="Btn_Grid" Font-Size="7pt" Font-Names="Verdana, Arial"
CommandName="editar" CommandArgument="<%# ((GridViewRow)Container).RowIndex %>" />
</ItemTemplate>
<HeaderStyle Width="66px" />
</asp:TemplateField>
<asp:TemplateField HeaderStyle-Width="66px" HeaderText="FEEDBACK">
<ItemTemplate>
<asp:Button ID="Btn_Feedback" runat="server" Text="ADICIONAR" CssClass="Btn_Grid" Font-Size="7pt" Font-Names="Verdana,Arial"
CommandName="feedback" CommandArgument="<%# ((GridViewRow)Container).RowIndex %>" />
</ItemTemplate>
<HeaderStyle Width="66px" />
</asp:TemplateField>
</columns>
<EditRowStyle ForeColor="Black" CssClass="GridViewEditRow" />
<FooterStyle BackColor="#CCCCCC" />
<HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" BorderColor="White" BorderStyle="Solid" BorderWidth="1px" />
<PagerSettings Mode="NumericFirstLast" FirstPageText="First" LastPageText="Last" PageButtonCount="5" />
<PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalAlign="Left" />
<RowStyle BackColor="White" />
<SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
</asp:GridView>
CodeBehind:
public partial class TodosChamados : System.Web.UI.Page
{
BDUsuarios usr = new BDUsuarios();
BDFuncionalidades func = new BDFuncionalidades();
BDChamados ch = new BDChamados();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
GridView1.DataSource = ch.BuscaTodosChamados();
GridView1.DataBind();
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if (e.Row.Cells[1].Text == "ALTA")
{
e.Row.Cells[1].BackColor = System.Drawing.Color.Red;
e.Row.ControlStyle.Font.Bold = true;
}
}
if (e.Row.Cells[0].Visible = e.Row.RowType == DataControlRowType.Pager)
{
e.Row.Cells[0].Visible = false;
}
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName != "Sort")
{
if (e.CommandName == "visualizar")
{
Session["id"] = GridView1.Rows[Convert.ToInt32(e.CommandArgument.ToString())].Cells[0].Text;
Session["editar"] = null;
}
else if (e.CommandName == "editar")
{
Session["id"] = GridView1.Rows[Convert.ToInt32(e.CommandArgument.ToString())].Cells[0].Text; //Grava o ID do chamado da linha correspondente.
Session["editar"] = 1; // 1 - Editar 2 - Não Editar .
}
else if (e.CommandName == "feedback")
{
Session["id"] = GridView1.Rows[Convert.ToInt32(e.CommandArgument.ToString())].Cells[0].Text; //Grava o ID do chamado da linha correspondente.
Response.Redirect("~/Adm/Feedback.aspx");
}
Response.Redirect("~/Adm/DetalhesChamado.aspx");
}
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
GridView1.DataSource = ch.BuscaTodosChamados();
GridView1.DataBind();
}

Answer 1

Update 2
Now i hopefully have found the reason for your pager not being shown. You are making the first colum invisible, even for the pager-row in RowDataBound, but the pager is sitting in the first cell by default:
e.Row.Cells[0].Visible = false;
You have to check the correct RowType:
e.Row.Cells[0].Visible = e.Row.RowType == DataControlRowType.Pager;
or even better on the aspx markup:
<asp:BoundField HeaderText="ID" DataField="id" Visible="False" />
A silly question, have you set AllowPaging to true?
<asp:GridView Id="GridView1" runat="server" AllowPaging="True" >
<PagerSettings Mode="NumericFirstLast" FirstPageText="First" LastPageText="Last" PageButtonCount="5" />
</asp:gridview>
GridView.AllowPaging Property
true if the paging feature is enabled; otherwise, false. The default is false.
You should also databind the GridView only if(!IsPostBack) when viwstate is enabled(default).
So wrap your databind code from Page_Load(i guess) into this check:
protected void Page_Load(Object sender, EventArgs e)
{
if(!IsPostBack)
{
GridView1.DataSource = ch.BuscaTodosChamados();
GridView1.DataBind();
}
}
Otherwise events won't be triggered and changes will be overwritten when you reload data on postback.
Update According to your last edit:
I assume that your RowCommand is the reason for this issue. It is called before the PageIndexChanging event and it is triggered also when the page changes(if i remember correctly). So have a look at your Response.Redirect which happens when no if/else-if will catch it which seems to be the case.
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName != "Sort")
{
if (e.CommandName == "visualizar")
{
// ..
}
else if (e.CommandName == "editar")
{
//..
}
else if (e.CommandName == "feedback")
{
//..
}
Response.Redirect("~/Adm/DetalhesChamado.aspx");
}
}

Answer 2

You must specify the event for OnPageIndexChanging in your .aspx. It should be:
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
OnPageIndexChanging = "GridView1_PageIndexChanging"
AutoGenerateColumns="False" DataKeyNames="LastName,FirstName"
EnablePersistedSelection="True" SelectedRowStyle-BackColor="Yellow"
DataSourceID="SqlDataSource1" AllowSorting="True">
You might be having the same problem here
UPDATE
Make sure that the data that's being bound to the GridView is more that 5 since PageSize="5". If the number of rows is less than 5, then the pager will not be shown.