asp.net gridview control

Try this

protected void gridview_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        (Image) img=((Image)e.Row.FindControl("Image control id"));
    }
}

E.g. you have Gridview1 with 3 columns picturid,picturname,picture.

<asp:templatefield xmlns:asp="#unknown">
      <itemtemplate>/*3rd column of gridview*/
        <asp:image id="Image1" imageurl="~/images/ab.jpg" runat="server" />
      </itemtemplate>
    </asp:templatefield>

RowDataBound event of your gridview:

protected Gridview1_RowDataBound(object sender, GridViewRowEventArgs e)
{
     if (e.Row.RowType == DataControlRowType.DataRow)
     {
            Image desired_image = (Image)e.Row.Cells[2].FindControl("Image1 ");
     }
}

Hi...
see this.

<asp:templatefield xmlns:asp="#unknown">
      <itemtemplate>/*3rd column of gridview*/
        <asp:image id="Image1" imageurl='<% .aspx?id="img"%>'; runat="server" />
      </itemtemplate>
    </asp:templatefield>

thank u

Hi...
I think this is right one to it.

<asp:ImageField AlternateText="ImageUrl" DataAlternateTextField="ImageUrl"
                    DataImageUrlField="ImageUrl" HeaderText="ImageUrl" ControlStyle-Width="100px">

thank u.

For binding images to GridView, use Handler Class. It is the best practice.
You just need to call the class on ImageUrl prperty of Image Control like below.

<asp:Image ID="Image1" runat="server" ImageUrl='<%# "ImageHandler.ashx?ImID="+ Eval("ImageID") %>' Height="150px" Width="150px"/>

And get the image from DataBase in that Handler only.

Follow the below articles for implementations and code.
1. how to insert images into database and how to retrieve and bind images to gridview using asp.net (or) save and retrieve images from database using asp.net[^].
2. Display Images In GridView From DataBase Asp.Net[^].
3. Inserting Images into Database and Display it in GridView through Handler.ashx[^]