Question

I want to make custom paging in GridView in ASP.Net, my data source is a object data.
I checked the web to find any code for this and found one which is not working for me.

  protected void invoiceReportsgridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        if (sender != null)
        {
            displayInvListgridView.PageIndex = e.NewPageIndex;
            displayInvListgridView.EditIndex = -1;
            displayInvListgridView.SelectedIndex = -1;
        }
    }

    protected void GridView_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Pager)
        {
            CustomizePageBar(e);
        }
    }

    void ProductsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
    {
        // If multiple buttons are used in a GridView control, use the
        // CommandName property to determine which button was clicked.
        if (e.CommandName == "Add")
        {
            // Convert the row index stored in the CommandArgument
            // property to an Integer.
            int index = Convert.ToInt32(e.CommandArgument);

            // Retrieve the row that contains the button clicked 
            // by the user from the Rows collection.
            GridViewRow row = displayInvListgridView.Rows[index];

            // Create a new ListItem object for the product in the row.     
            ListItem item = new ListItem();
            item.Text = Server.HtmlDecode(row.Cells[1].Text);

            // If the product is not already in the ListBox, add the ListItem 
            // object to the Items collection of the ListBox control. 
            //if (!displayInvListgridView.Items.Contains(item))
            //{
            //    displayInvListgridView.Items.Add(item);
            //}
        }
    }

    private void CustomizePageBar(GridViewRowEventArgs e)
    {

        //Table tblPager = new Table();
        tblPager.BorderWidth = 0;
        tblPager.CellPadding = 0;
        tblPager.CellSpacing = 0;
        tblPager.Width = Unit.Percentage(100);
        tblPager.Height = Unit.Pixel(20);

        //add a row for our pager contents
        tblPager.Rows.Add(new TableRow());

        //Spacer Cell
        TableCell tcelSpace = new TableCell();
        tcelSpace.Width = Unit.Pixel(360);


        //Page x of y Cell
        TableCell tcelXofY = new TableCell();
        tcelXofY.Width = Unit.Pixel(100);

        Label litXofY = new Label();
        litXofY.Text = "Page " + (displayInvListgridView.PageIndex + 1) + " of " + displayInvListgridView.PageCount;
        litXofY.Font.Bold = true;
        tcelXofY.Controls.Add(litXofY);


        //lable GoTo
        Label lblGoto = new Label();
        lblGoto.Text = "GoTo: ";
        lblGoto.ID = "lblGoTo";
        lblGoto.Font.Bold = true;
        lblGoto.Font.Size = displayInvListgridView.PagerStyle.Font.Size;

        TableCell tcelGoto = new TableCell();
        tcelGoto.Width = Unit.Pixel(25);
        tcelGoto.Controls.Add(lblGoto);


        //Pick drop downlist
        TableCell tcelPickPage = new TableCell();
        tcelPickPage.Width = Unit.Pixel(25);
        //The dropdown list box
        DropDownList ddlPickPage = new DropDownList();
        ddlPickPage.ID = "ddlPick";
        ddlPickPage.AutoPostBack = true;
        ddlPickPage.EnableViewState = true;
        ddlPickPage.Font.Size = displayInvListgridView.PagerStyle.Font.Size;

        for (int index = 1; index <= displayInvListgridView.PageCount; index++)
        {
            ddlPickPage.Items.Add(index.ToString());
        }
        ddlPickPage.SelectedIndex = displayInvListgridView.PageIndex;

        //handle event for picklist
        ddlPickPage.SelectedIndexChanged += new EventHandler(OnPagePicked);
        tcelPickPage.Controls.Add(ddlPickPage);

        //The existing Nav controls
        TableCell tcelNav = new TableCell();
        tcelNav.Width = Unit.Pixel(150);

        //for move all existing controls
        foreach (Control ctrl in e.Row.Cells[0].Controls)
        {
            tcelNav.Controls.Add(ctrl);
        }

        // add all cells to new pager

        tblPager.Rows[0].Cells.Add(tcelSpace);
        tblPager.Rows[0].Cells.Add(tcelXofY);
        tblPager.Rows[0].Cells.Add(tcelGoto);
        tblPager.Rows[0].Cells.Add(tcelPickPage);
        tblPager.Rows[0].Cells.Add(tcelNav);


        //replace grids pager with new
        e.Row.Cells[0].Controls.Add(tblPager);

    }


    protected void OnPagePicked(object sender, EventArgs e)
    {
        DropDownList ddlPick = (DropDownList)sender;
        displayInvListgridView.PageIndex = Convert.ToInt32(ddlPick.SelectedItem.Value) - 1;
        //Raise page index changed so user can rebind data

        GridViewPageEventArgs gvArgs = new GridViewPageEventArgs(Convert.ToInt32(ddlPick.SelectedItem.Value) - 1);
        //OnPageIndexChanging(gvArgs);
        GridViewPageEventArgs ex = new GridViewPageEventArgs(Convert.ToInt32(ddlPick.SelectedItem.Value) - 1);
        invoiceReportsgridView_PageIndexChanging(sender, gvArgs);
    }

Answer 1

The idea behind the manual Gridview paging is that you need to rebind the gridview on each page change, and also you need to change the page index. Here is a simple example:

//This is the method to bind the gridview to the data.
private void LoadGridview()
{
    List<MyObject> MyObjectList = MyObject.FillMyList();
    if (MyObjectList != null && MyObjectList.Count > 0)
    {
        this.GridView1.DataSource = MyObjectList;
        this.GridView1.DataBind();
    }
}

//When the index changes
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    //Changes the page
    this.GridView1.PageIndex = e.NewPageIndex;
    LoadGridview();
}
protected void Page_Load(object sender, EventArgs e)
{
    //When the page loads
    LoadGridview();
}

Good luck!