I Have 3 Dropdown List In A Page, I Want To Validate That If I Select Two Or More Dropdown List At A Time It Alert Message "Select Only One Value"

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i have 3 dropdown list in a page, i want to validate that if i select two or more dropdown list at a time it alert message "select only one value"

Posted 16-Aug-14 4:20am

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amer007112 · Answer 1 · 2014-08-16T05:51:00

C#

protected void Page_Load(object sender, EventArgs e)
{
  CheckForMoreThanOneSelectedItem();

}

protected void CheckForMoreThanOneSelectedItem()
{
  bool MoreThanOneSelected = false;
  if(ddl1.SelectedIndex != 0 &&( ddl2.SelectedIndex !=0 ||ddl3.SelectedIndex != 0) )
  {
    MoreThanOneSelected = true;
  }
  if(ddl2.SelectedIndex != 0 &&( ddl1.SelectedIndex !=0 ||ddl3.SelectedIndex != 0) )
  {
    MoreThanOneSelected = true;
  }
  if(ddl3.SelectedIndex != 0 &&( ddl1.SelectedIndex !=0 ||ddl2.SelectedIndex != 0) )
  {
    MoreThanOneSelected = true;
  }

  if(MoreThanOneSelected==true)
  {
    Alret The Message
  }
}

it might not be the best answer...but try it and let me know if it works,
make sure to set the AutoPostBack Propertie of your three DropDownLists to True