ShowHideGridViewColumnsClient.aspx.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text;

public partial class ShowHideGridViewColumnsClient : System.Web.UI.Page
{
    #region Properties & Fields

    /// <summary>
    /// List of column names
    /// </summary>
    List<string> columnNames = new List<string>() { "Id", "Description", "Assigned To", "Status" };

    #endregion

    #region Page Load

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            _sampleData = null;

            // Populate the GridView
            this.GridView1.DataSource = _sampleData;//51aspx
            this.GridView1.DataBind();

            // Setup the dropdown list to allow the user to show hidden columns
            SetupShowHideColumns(this.GridView1, this.GridView1ShowHideColumns);
        }
    }

    #endregion

    #region GridView Events

    protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
    {
        GridView gridView = (GridView)sender;
        StringBuilder sb = new StringBuilder();

        // For the header row add a link to each header
        // cell which can call the HideCol javascript method
        if (e.Row.RowType == DataControlRowType.Header)
        {
            // Loop through each cell of the row
            for (int columnIndex = 0; columnIndex < e.Row.Cells.Count; columnIndex++)
            {
                // Build the hide column link
                sb.Remove(0, sb.Length); // first empty the StringBuilder
                sb.Append("javascript:HideCol('");