Implement Server Side Paging Sorting and Filtering in ASP.Net GridView using C# and VB.Net

Hi mclinton,

Refer below exmple.

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

HTML

Search Customer:
<asp:TextBox ID="txtSearch" runat="server"></asp:TextBox>
<asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="OnSearch" />
<hr />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" AllowPaging="true"
    AllowSorting="true" OnSorting="OnSorting" OnPageIndexChanging="OnPageIndexChanging" PageSize="5">
    <Columns>
        <asp:TemplateField HeaderText="Customer ID" SortExpression="CustomerID">
            <ItemTemplate>
                <%# Eval("CustomerID")%>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="ContactName" HeaderText="Contact Name" SortExpression="ContactName" />
        <asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
        <asp:BoundField DataField="Country" HeaderText="Country" SortExpression="Country" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

private string SortDirection
{
    get { return ViewState["SortDirection"] != null ? ViewState["SortDirection"].ToString() : "ASC"; }
    set { ViewState["SortDirection"] = value; }
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid(name: txtSearch.Text.Trim());
    }
}

private void BindGrid(string sortExpression = null, string name = null)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    string sql = "SELECT CustomerId, ContactName, City, Country FROM Customers";
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            if (!string.IsNullOrEmpty(name))
            {
                sql += " WHERE ContactName LIKE @ContactName + '%'";
                cmd.Parameters.AddWithValue("@ContactName", name);
            }
            cmd.Connection = con;
            cmd.CommandText = sql;
            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
            {
                using (DataTable dt = new DataTable())
                {
                    sda.Fill(dt);
                    if (sortExpression != null)
                    {
                        DataView dv = dt.AsDataView();
                        this.SortDirection = this.SortDirection == "ASC" ? "DESC" : "ASC";

                        dv.Sort = sortExpression + " " + this.SortDirection;
                        GridView1.DataSource = dv;
                    }
                    else
                    {
                        GridView1.DataSource = dt;
                    }
                    GridView1.DataBind();
                }
            }
        }
    }
}

protected void OnPageIndexChanging(object sender, GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    this.BindGrid(name: txtSearch.Text.Trim());
}

protected void OnSorting(object sender, GridViewSortEventArgs e)
{
    this.BindGrid(e.SortExpression, txtSearch.Text.Trim());
}

protected void OnSearch(object sender, EventArgs e)
{
    this.BindGrid(name: txtSearch.Text.Trim());
}

VB.Net

Private Property SortDirection As String
    Get
        Return IIf(ViewState("SortDirection") IsNot Nothing, Convert.ToString(ViewState("SortDirection")), "ASC")
    End Get
    Set(value As String)
        ViewState("SortDirection") = value
    End Set
End Property

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Me.BindGrid(name:=txtSearch.Text.Trim())
    End If
End Sub

Private Sub BindGrid(Optional sortExpression As String = Nothing, Optional name As String = Nothing)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim sql As String = "SELECT CustomerId, ContactName, City, Country FROM Customers"
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand()
            If Not String.IsNullOrEmpty(name) Then
                sql += " WHERE ContactName LIKE @ContactName + '%'"
                cmd.Parameters.AddWithValue("@ContactName", name)
            End If
            cmd.Connection = con
            cmd.CommandText = sql
            Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                Using dt As DataTable = New DataTable()
                    sda.Fill(dt)
                    If sortExpression IsNot Nothing Then
                        Dim dv As DataView = dt.AsDataView()
                        Me.SortDirection = If(Me.SortDirection = "ASC", "DESC", "ASC")
                        dv.Sort = sortExpression & " " & Me.SortDirection
                        GridView1.DataSource = dv
                    Else
                        GridView1.DataSource = dt
                    End If
                    GridView1.DataBind()
                End Using
            End Using
        End Using
    End Using
End Sub

Protected Sub OnPageIndexChanging(sender As Object, e As GridViewPageEventArgs)
    GridView1.PageIndex = e.NewPageIndex
    Me.BindGrid(name:=txtSearch.Text.Trim())
End Sub

Protected Sub OnSorting(sender As Object, e As GridViewSortEventArgs)
    Me.BindGrid(e.SortExpression, txtSearch.Text.Trim())
End Sub

Protected Sub OnSearch(sender As Object, e As EventArgs)
    Me.BindGrid(name:=txtSearch.Text.Trim())
End Sub

Screenshot