Share examples of gridview automatic sorting

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using ;

public partial class _Default :
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
// Set the initial sorting parameter value

// Incorrect property setting method: SortExpression and SortDirection are both read-only properties of GridView and cannot be assigned directly.
            //this. = "id";
            //this. = "ASC";

// Correct property setting method
            this.("SortExpression", "id");
            this.("SortDirection", "ASC");

// Bind the data source to GridView
            ();
        }
    }

    /// <summary>
/// GridView sorting event
    /// </summary>
    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {
// Get sorted data column from event parameters
        string sortExpression = ();

// Assume that the sorting direction is "order"
        string sortDirection = "ASC";

// Compare the sorting direction obtained by the event parameters and modify the GridView sorting direction parameters.
        if (sortExpression == this.["SortExpression"])
        {
//Get the next sorting status
            sortDirection = (this.["SortDirection"].ToString() == sortDirection ? "DESC" : "ASC");
        }

// Reset the GridView sorting data column and sorting direction
        this.["SortExpression"] = sortExpression;
        this.["SortDirection"] = sortDirection;

        ();
    }

    /// <summary>
/// Bind to GridView
    /// </summary>
    private void BindGridView()
    {
// Get the GridView sorting data column and sorting direction
        string sortExpression = this.["SortExpression"];
        string sortDirection = this.["SortDirection"];

// Call the business data acquisition method
        DataTable dtBind = ();

//Set the default data view displayed according to the GridView sorting data column and sorting direction
        if ((!(sortExpression)) && (!(sortDirection)))
        {
            = ("{0} {1}", sortExpression, sortDirection);
        }

// GridView binds and displays data
        this. = dtBind;
        this.();
    }

    /// <summary>
/// Method to obtain data source
    /// </summary>
/// <returns>Data Source</returns>
    private DataTable getDB()
    {
        DataTable dt = new DataTable();

        ("id");
        ("name");
        ("age");

        (new object[] { "000001", "hekui", "26" });
        (new object[] { "000002", "zhangyu", "26" });
        (new object[] { "000003", "zhukundian", "27" });
        (new object[] { "000004", "liyang", "25" });
        (new object[] { "000005", "caili", "27" });

        return dt;
    }
}