How to SELECT a dropdown list item by value programmatically

Question

How to SELECT a drop down list item by value programatically in C  NET

User · Answer

Ian Boyd  above  had a great answer -- Add this to Ian Boyd s class  WebExtensions  to select an item in a dropdownlist based on text        lt summary gt      Selects the item in the list control that contains the specified text  if it exists       lt  summary gt       lt param name  dropDownList  gt  lt  param gt       lt param name  selectedText  gt The text of the item in the list control to select lt  param gt       lt returns gt Returns true if the value exists in the list control  false otherwise lt  returns gt  public static Boolean SetSelectedText this DropDownList dropDownList  String selectedText        ListItem selectedListItem   dropDownList Items FindByText selectedText       if  selectedListItem    null                selectedListItem Selected   true          return true            else         return false      To call it   WebExtensions SetSelectedText MyDropDownList   MyValue

User · Answer

If you know that the dropdownlist contains the value you re looking to select  use   ddl SelectedValue    2     If you re not sure if the value exists  use  or you ll get a null reference exception    ListItem selectedListItem   ddl Items FindByValue  2     if  selectedListItem    null        selectedListItem Selected   true

User · Answer

ddlPageSize Items FindByValue  25   Selected   true

User · Answer

combobox1 SelectedValue   x    I suspect you may want yo hear something else  but this is what you asked for

User · Answer

ddl SetSelectedValue  2      With a handy extension   public static class WebExtensions             lt summary gt          Selects the item in the list control that contains the specified value  if it exists           lt  summary gt           lt param name  dropDownList  gt  lt  param gt           lt param name  selectedValue  gt The value of the item in the list control to select lt  param gt           lt returns gt Returns true if the value exists in the list control  false otherwise lt  returns gt      public static Boolean SetSelectedValue this DropDownList dropDownList  String selectedValue                ListItem selectedListItem   dropDownList Items FindByValue selectedValue            if  selectedListItem    null                        selectedListItem Selected   true              return true                    else             return false               Note  Any code is released into the public domain  No attribution required

User · Answer

Please try below   myDropDown SelectedIndex    myDropDown Items IndexOf myDropDown Items FindByValue  myValue

User · Answer

This is a simple way to select an option from a dropdownlist based on a string val  private void SetDDLs DropDownList d string val                ListItem li          for  int i   0  i  lt  d Items Count  i                          li   d Items i               if  li Value    val                                d SelectedIndex   i                  break

User · Answer

If anyone else is trying this and facing problem then let me point one possible problem  If you are using Web Application then inside Page Load if you are loading drop-down from DB and at the sametime you want to load data  then first load your drop-down lists and then load your data with selected drop-down conditions     protected void Page Load object sender  EventArgs e        if   this IsPostBack                LoadDropdown      drop-downs generated first         LoadData       other data loading and drop-down value selection logic here           And for successfully selecting drop-down from code follow the approved answer above which is      ddl SelectedValue    2         Hope it solves the problem

User · Answer

For those who come here by search  because this thread is over 3 years old    string entry    replace with search value  if  comboBox Items Contains entry      comboBox SelectedIndex   comboBox Items IndexOf entry   else    comboBox SelectedIndex   0

User · Answer

I prefer  if ddl Items FindByValue string     null        ddl Items FindByValue string  Selected   true      Replace ddl with the dropdownlist ID and string with your string variable name or value

[c#] How to SELECT a dropdown list item by value programmatically

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