rotate gridview rows into column with image column

Hi,

Please refer below code.

HTML

<div>
    <asp:GridView ID="GridView1" CssClass="Grid" HeaderStyle-CssClass="header" runat="server"
        OnRowDataBound="RowDataBound" AutoGenerateColumns="true">
    </asp:GridView>
    <br />
    <asp:Button ID="btnConvert1" runat="server" Text="Convert Rows to Columns" OnClick="Convert"
        CommandArgument="1" />
    <asp:Button ID="btnConvert2" runat="server" Text="Convert Columns to Rows" OnClick="Convert"
        CommandArgument="2" Visible="false" />
</div>

C#

// You need to set it as per your DataTable column
private int ImageColumnIndex = 3;

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] { new DataColumn("Item"), new DataColumn("Quantity"), new DataColumn("Price"), new DataColumn("Image"), new DataColumn("Total") });
        dt.Rows.Add("Chrysanthemum", 145, 500, "~/Images/Chrysanthemum.jpg", 72500);
        dt.Rows.Add("Hydrangeas", 0, 2000, "~/Images/Hydrangeas.jpg", 0);
        dt.Rows.Add("Jellyfish", 190, 1545, "~/Images/Jellyfish.jpg", 293550);
        dt.Rows.Add("Penguins", 30, 200, "~/Images/Penguins.jpg", 6000);
        ViewState["dt"] = dt;
        BindGrid(dt, false);
    }
}

protected void RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if (!btnConvert2.Visible)
        {
            Image img = new Image();
            img.ImageUrl = e.Row.Cells[ImageColumnIndex].Text;
            img.Height = 100;
            img.Width = 100;
            e.Row.Cells[ImageColumnIndex].Controls.Add(img);
        }
        else
        {
            if (e.Row.RowIndex == ImageColumnIndex)
            {
                for (int i = 1; i < e.Row.Cells.Count; i++)
                {
                    TableCell cell = e.Row.Cells[i];
                    Image img = new Image();
                    img.Height = 100;
                    img.Width = 100;
                    img.ImageUrl = e.Row.Cells[i].Text;
                    cell.Controls.Add(img);
                }
            }
        }
    }
}

private void BindGrid(DataTable dt, bool rotate)
{
    GridView1.ShowHeader = !rotate;
    GridView1.DataSource = dt;
    GridView1.DataBind();
    if (rotate)
    {
        foreach (GridViewRow row in GridView1.Rows)
        {
            row.Cells[0].CssClass = "header";
        }
    }
}

protected void Convert(object sender, EventArgs e)
{
    DataTable dt = (DataTable)ViewState["dt"];
    if ((sender as Button).CommandArgument == "1")
    {
        btnConvert1.Visible = false;
        btnConvert2.Visible = true;
        DataTable dt2 = new DataTable();
        for (int i = 0; i <= dt.Rows.Count; i++)
        {
            dt2.Columns.Add();
        }
        for (int i = 0; i < dt.Columns.Count; i++)
        {
            dt2.Rows.Add();
            dt2.Rows[i][0] = dt.Columns[i].ColumnName;
        }
        for (int i = 0; i < dt.Columns.Count; i++)
        {
            for (int j = 0; j < dt.Rows.Count; j++)
            {
                dt2.Rows[i][j + 1] = dt.Rows[j][i];
            }
        }
        BindGrid(dt2, true);
    }
    else
    {
        btnConvert1.Visible = true;
        btnConvert2.Visible = false;
        BindGrid(dt, false);
    }
}

Screenshot