Force user to select first DropDownList before selecting second in ASP.Net

Question

I have 2 Dropdownsay DD1 DD2 and 1 Listboxsay LB in my web formvalue of the 3 controls depend on each otherLB1 is dependent on DD2 value DD2 is dependent on DD1 valueI want that if user selects LB1 without selecting DD2 it should give a message that please select DD2 firstsimilarly if user Selects DD2 without selecting DD1 it should give a msg that Please select DD1 first using ASPNET CHow to achieve thisPlease reply

Azim · Accepted Answer

Using JQueryHTMLlthtml xmlns34httpwwww3org1999xhtml34gtlthead runat34server34gt    lttitlegtlttitlegt    ltscript src34httpajaxgoogleapiscomajaxlibsjquery1102jqueryminjs34gt    ltscriptgt    ltscript type34textjavascript34gt        documentreadyfunction              39idListBox139changefunction                  if 39idDropDownList239val  34Please Select34                     alert34Please Select Drop Down List2 34                    thisget0selectedIndex  0                                                            39idDropDownList239changefunction                  if 39idDropDownList139val  34Please Select34                     alert34Please Select Drop Down List1 34                    thisget0selectedIndex  0

Azim · Answer

Without using JqueryHTMLltform id34form134 runat34server34gt    ltdivgt        lttable border34234 cellpadding34534 cellspacing34034gt            lttrgt                lttdgt                    After SSC                lttdgt                lttdgt                    ltaspDropDownList ID34DropDownList134 runat34server34gt                        ltaspListItem Text34Please Select34 gt                        ltaspListItem Text34Diploma34 gt                        ltaspListItem Text34FYJCSYJC34 gt                    ltaspDropDownListgt                lttdgt            lttrgt            lttrgt                lttdgt                    After Diploma  SYJC                lttdgt                lttdgt                    ltaspDropDownList ID34DropDownList234 runat34server34 AutoPostBack34true34 OnSelectedIndexChanged

Force user to select first DropDownList before selecting second in ASP.Net

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