how to retrive image from folder to gridvew using image path from database

Try the followings:

1. Add an Image field to the GridView and convert the field to Template field

<asp:GridView ID="GridView1" runat="server"
            onrowdatabound="GridView1_RowDataBound">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Image ID="Image1" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
</asp:GridView>

2. Inside the RowDataBound() event method, find the Image control and assign the ImageUrl property as follows:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
       if (e.Row.RowType == DataControlRowType.DataRow)
       {
           int Id = Convert.ToInt32(e.Row.DataItem);
           Image img = e.Row.FindControl("Image1") as Image;
           img.ImageUrl = GetImageUrl(Id);
       }
}

Build an appropriate Image Url inside the GetImageUrl(Id) method using the Image Id. From the Database you know the actual physical location of the image and if the image is stored within the web application folder, you just need to calculate the relative path of the images based upon their physical path within the folder.

Hope this helps.