Selecting a item from one data table and getting the items from another - csharp

[Pabicoch]

Hi ok i have 3 tables "pics", "shows" and "showspics".

I have a list box which displays all the titles of the shows(listbox1) and a list box which shows all the titles of the pictures in that show(listbox2).

Im havin a problem filling the latter listbox (listbox2). I know I need to use data sets, adapters etc but everything i try keeps failing. Heres my code

            DataRowView drv = (DataRowView)listBox1.SelectedItem;
            //set contents of the textbox on form title
            string variable1 = drv["title"].ToString();
 
int x = 0;
                string user = Environment.UserName;
 
 
                        sqlSelectCommand5.Connection.Open();
                        sqlSelectCommand5.Parameters["@showName"].Value = variable1;
                        sqlSelectCommand5.Parameters["@user"].Value = user;
                        sqlSelectCommand5.Parameters["@showid"].Value = variable3;
 
                        sqlDataAdapterShowPics.Fill(dataSetShowPics1);
 
                        sqlSelectCommand5.Connection.Close();
 
 
                while (x < dataSetShowPics1.photos.Count);
                {
 
                        string myPhotos = dataSetShowPics1.photos.Rows[x]["Expr1"].ToString();
 
                        listBox2.Items.Add(myPhotos);
                        x++;

my sql script in dataAdapterShowPics is:

SELECT shows.title, shows.showid, showspics.photoid, pics.photo, shows.userid, pics.title AS Expr1
FROM pics INNER JOIN
showpics ON pics.photoid = showpics.photoid INNER JOIN
shows ON showpics.showid = shows.showid
WHERE (shows.title = @showName) AND (shows.userid = @user)



Anyone have any ideas. I keep gettin the error message

"Input string was not in a correct format.Couldn't store <13656_173909643315_507673315_2984797_5377316_n> in Expr1 Column. Expected type is Int32."


("13656_173909643315_507673315_2984797_5377316_ n" is the picture name in the selected show)



Please help as Ive been trying to do this for over 12 hours now. I really need to get this done by tomorrow. Im at the end of my tether. I really do need all the help i can get I'm new to programming so be gentle n dumb things down as much as you can pretty please :-)