Reference

Dynamically change GridView Row Background Color based on condition in ASP.Net using C# and VB.Net

HTML

<asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
    runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_OnRowDataBound">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30" />
        <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
        <asp:BoundField DataField="Color" HeaderText="Color" ItemStyle-Width="150" />
    </Columns>
</asp:GridView>

Namespaces

using System.Data;
using System.Drawing;

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Color",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "Red");
        dt.Rows.Add(2, "Mudassar Khan", "Green");
        dt.Rows.Add(3, "Suzanne Mathews", "Blue");
        dt.Rows.Add(4, "Robert Schidner", "Green");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
       string color = e.Row.Cells[2].Text;
       e.Row.Cells[2].ForeColor = Color.White;
       e.Row.Cells[2].BackColor = Color.FromName(color);
    }    
}

Screenshot