c# - How to get index of a column by name in a DataTable

Get index of a DataColumn from a DataTable
IndexOfMethodDataTable.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html>
<script runat="server">
    void Button1_Click(object sender, System.EventArgs e)
    {
        DataTable dt = new DataTable();
        dt.TableName = "Books";

        DataColumn dc = new DataColumn();
        dc.ColumnName = "BookID";
        dc.DataType = typeof(int);

        DataColumn dc2 = new DataColumn();
        dc2.ColumnName = "BookName";
        dc2.DataType = typeof(string);

        DataColumn dc3 = new DataColumn();
        dc3.ColumnName = "Author";
        dc3.DataType = typeof(string);

        dt.Columns.AddRange(new DataColumn[] {dc,dc2,dc3});

        dt.Rows.Add(new object[] { "1", "Native Video in HTML5", "David Griffiths" });
        dt.Rows.Add(new object[] { "2", "Best iPhone Apps, Second Edition", "J.D. Biersdorfer" });
        dt.Rows.Add(new object[] { "3", "Microsoft® Silverlight® 4 Step by Step", "Laurence Moroney" });
        dt.Rows.Add(new object[] { "4", "Premiere Elements 8: The Missing Manual", "Chris Grover" });
        
        GridView1.DataSource = dt;
        GridView1.DataBind();

        //this line get the 'Author' DataColumn index in DataTable
        int columnIndex = dt.Columns.IndexOf("Author");
        Label1.Text = "'Author' DataColumn index in DataTable? = " + columnIndex;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to get the index of the DataColumn with the specific name from DataTable in ado.net</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            Using IndexOf() method - How to get the index of the
            <br /> DataColumn with the specific name from DataTable in ado.net
        </h2>
        <hr width="550" align="left" color="CornFlowerBlue" />
        <asp:GridView 
            ID="GridView1"
            runat="server"
            BorderColor="Snow"
            ForeColor="Snow"
            Width="525"
            HeaderStyle-BackColor="DarkOrchid"
            RowStyle-BackColor="SlateBlue"
            AlternatingRowStyle-BackColor="MediumSlateBlue"
            >
        </asp:GridView>
        <br /><br />
        <asp:Label
             ID="Label1"
             runat="server"
             Font-Size="Large"
             ForeColor="IndianRed"
             >
        </asp:Label>
        <br /><br />
        <asp:Button 
            ID="Button1"
            runat="server"
            OnClick="Button1_Click"
            Text="Populate GridView"
            Height="45"
            Font-Bold="true"
            ForeColor="DarkBlue"
            />
    </div>
    </form>
</body>
</html>
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