正被别的用户锁定

admin_company.aspx?Jid=1(或2,3,4,5)就是在这一个页面. 在更新admin_company.aspx?Jid=1是正常的.更新别的例如:admin_company.aspx?Jid=2就提示"无法保存,正在被别的用户锁定" 这是为什么啊
protected void updata_Click(object sender, EventArgs e)//更新
{
int jid = Convert.ToInt32(ViewState["cid"].ToString());
OleDbConnection con = DB.conDB();
OleDbCommand cmd = new OleDbCommand("update [company] set [content]=@content where [jid]=" + jid, con);
cmd.Parameters.Add(new OleDbParameter("@content", OleDbType.VarChar, 8000));
cmd.Parameters["@content"].Value = this.FreeTextBox1.Text;
con.Open();
cmd.ExecuteNonQuery();
con.Close();

this.Response.Write(" <script>alert('更新成功'); </script>");
}