ASP.Net: Can we store the data in Excel file in the machine PC directly

I have a Stored Procedure

Create procedure selectdata
as 
begin
    select * from Employee
end

In my front End I Created a Button in default.aspx page

 <asp:Button id="btnsave" runat="server" Text="Send to Excel" onclick="btnsave_Click"/> <asp:GridView id="gv" runat="server" > </asp:GridView>

In default.aspx.cs

protected void btnsave_Click(object sender, EventArgs e)
{
    SqlConnection conn = new SqlConnection();
    conn.ConnectionString="User id=aa; password=123; Initial Catalog=abc;Integrated Security=xxxx";
    SqlCommand cmd = new SqlCommand();
    cmd.Connection = conn;
    cmd.CommandText = "selectdata";
    cmd.CommandType = CommandType.StoredProcedure;
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    da.Fill(ds);
    gv.DataSource = ds;
    gv.DataBind();
}

Output: It Displays the Data in Grid View   but is it possible to store the Data directly in Excel file in my PC