How to Make an bitwise OR operation

Hi,,,
pls tel me i've a string of array i wanted to make an bitwise OR Operation so how can i acheieve it...
here my Vode go through and find soln..

 if (ds.Tables[0].Rows.Count >0)
            {
                 if(Pwd==ds.Tables[0].Rows[0]["Password"].ToString());
                //Count="Select Count(UserId) from tblUserGrpMap Where UserId='"+txtUser.Text.Trim()+"'";
                 string getQuery = "Select U.UserID,Grp.PrivilegeID From tblUserGrpMap U Left Outer Join tblGroupPrivMst Grp On U.GroupCode=Grp.GroupCode Where U.UserId= '" + txtUser.Text.Trim() + "'";
                 SqlCommand cmd2 = new SqlCommand(getQuery, cnn);
                 cnn.Open();
                 cmd.ExecuteNonQuery();
                 SqlDataAdapter ada2 = new SqlDataAdapter(cmd2);
                 DataSet ds2 = new DataSet();
                 ada2.Fill(ds2);
                 if (ds2.Tables[0].Rows.Count > 0)
                 {
                     int i = 0;
                     string[] arr1 = new string[10];
                     while (i < ds2.Tables[0].Rows.Count)
                     {
                         arr1[i] = ds2.Tables[0].Rows[i]["PrivilegeID"].ToString();
                         i++;
                     }
                     i = 0;
                     while (i < arr1.Length)
                     {
                         arr1[i] = arr1[i] | arr1[i + 1];
                         i++;
                     }
                                        
                 }    

I got erreo

Cannot applied opearnds | to string to string

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