Asp net - Add blank item at top of dropdownlist

Question

Why is the dropdown not showing my blank item first  Here is what I have  drpList Items Add New ListItem           With drpList      DataSource   myController GetList userid       DataTextField    Name       DataValueField    ID       DataBind   End With   Edit   I am binding to a Generig List  could this be the culprit

User · Answer

The databinding takes place after you ve added your blank list item  and it replaces what s there already  you need to add the blank item to the beginning of the List from your controller  or add it after databinding   EDIT   After googling this quickly as of ASP Net 2 0 there s an  AppendDataBoundItems  true property that you can set to   append the databound items   for details see  http   imar spaanjaars com QuickDocId aspx quickdoc 281 or   http   msdn microsoft com en-us library system web ui webcontrols listcontrol appenddatabounditems aspx

User · Answer

The databinding takes place after you ve added your blank list item  and it replaces what s there already  you need to add the blank item to the beginning of the List from your controller  or add it after databinding   EDIT   After googling this quickly as of ASP Net 2 0 there s an  AppendDataBoundItems  true property that you can set to   append the databound items   for details see  http   imar spaanjaars com QuickDocId aspx quickdoc 281 or   http   msdn microsoft com en-us library system web ui webcontrols listcontrol appenddatabounditems aspx

User · Answer

it looks like you are adding a blank item  and then databinding  which would empty the list  try inserting the blank item after databinding

User · Answer

ddlCategory DataSource   ds  ddlCategory DataTextField    CatName   ddlCategory DataValueField    CatID    C  ch 1   ddlCategory Items Add new ListItem  --please select--    -1     ddlCategory AppendDataBoundItems   true  ddlCategory SelectedIndex   -1   ddlCategory DataBind     C  ch 2   ddlCategory Items Insert 0  new ListItem  -- please select --    0       Tested OK

User · Answer

I think a better way is to insert the blank item first  then bind the data just as you have been doing  However you need to set the AppendDataBoundItems property of the list control   We use the following method to bind any data source to any list control     public static void BindList ListControl list  IEnumerable datasource  string valueName  string textName        list Items Clear        list Items Add              list AppendDataBoundItems   true      list DataValueField   valueName      list DataTextField   textName      list DataSource   datasource      list DataBind

User · Answer

After your databind   drpList Items Insert 0  new ListItem String Empty  String Empty    drpList SelectedIndex   0

User · Answer

After your databind   drpList Items Insert 0  new ListItem String Empty  String Empty    drpList SelectedIndex   0

User · Answer

Do your databinding and then add the following   Dim liFirst As New ListItem         drpList Items Insert 0  liFirst

User · Answer

simple   at last   ddlProducer Items Insert 0

User · Answer

Do your databinding and then add the following   Dim liFirst As New ListItem         drpList Items Insert 0  liFirst

User · Answer

it looks like you are adding a blank item  and then databinding  which would empty the list  try inserting the blank item after databinding

User · Answer

You can use AppendDataBoundItems true to easily add   lt asp DropDownList ID  quot drpList quot  AppendDataBoundItems  quot true quot  runat  quot server quot  gt       lt asp ListItem Text  quot  quot  Value  quot  quot    gt   lt  asp DropDownList gt

User · Answer

After your databind   drpList Items Insert 0  new ListItem String Empty  String Empty    drpList SelectedIndex   0

User · Answer

Do your databinding and then add the following   Dim liFirst As New ListItem         drpList Items Insert 0  liFirst

User · Answer

You could also have a union of the blank select with the select that has content   select    value     name union select value  name from mytable

User · Answer

ddlCategory DataSource   ds  ddlCategory DataTextField    CatName   ddlCategory DataValueField    CatID    C  ch 1   ddlCategory Items Add new ListItem  --please select--    -1     ddlCategory AppendDataBoundItems   true  ddlCategory SelectedIndex   -1   ddlCategory DataBind     C  ch 2   ddlCategory Items Insert 0  new ListItem  -- please select --    0       Tested OK

User · Answer

You can use AppendDataBoundItems true to easily add   lt asp DropDownList ID  quot drpList quot  AppendDataBoundItems  quot true quot  runat  quot server quot  gt       lt asp ListItem Text  quot  quot  Value  quot  quot    gt   lt  asp DropDownList gt

User · Answer

Like  Whisk  Said  the trick is in  AppendDataBoundItems  property  protected void Page Load object sender  EventArgs e        if   IsPostBack                DropDownList1 AppendDataBoundItems   true          DropDownList1 Items Insert 0  new ListItem String Empty  String Empty            DropDownList1 SelectedIndex   0            Thanks  Whisk

User · Answer

Do your databinding and then add the following   Dim liFirst As New ListItem         drpList Items Insert 0  liFirst

User · Answer

it looks like you are adding a blank item  and then databinding  which would empty the list  try inserting the blank item after databinding

User · Answer

I think a better way is to insert the blank item first  then bind the data just as you have been doing  However you need to set the AppendDataBoundItems property of the list control   We use the following method to bind any data source to any list control     public static void BindList ListControl list  IEnumerable datasource  string valueName  string textName        list Items Clear        list Items Add              list AppendDataBoundItems   true      list DataValueField   valueName      list DataTextField   textName      list DataSource   datasource      list DataBind

User · Answer

The databinding takes place after you ve added your blank list item  and it replaces what s there already  you need to add the blank item to the beginning of the List from your controller  or add it after databinding   EDIT   After googling this quickly as of ASP Net 2 0 there s an  AppendDataBoundItems  true property that you can set to   append the databound items   for details see  http   imar spaanjaars com QuickDocId aspx quickdoc 281 or   http   msdn microsoft com en-us library system web ui webcontrols listcontrol appenddatabounditems aspx

User · Answer

it looks like you are adding a blank item  and then databinding  which would empty the list  try inserting the blank item after databinding

User · Answer

The databinding takes place after you ve added your blank list item  and it replaces what s there already  you need to add the blank item to the beginning of the List from your controller  or add it after databinding   EDIT   After googling this quickly as of ASP Net 2 0 there s an  AppendDataBoundItems  true property that you can set to   append the databound items   for details see  http   imar spaanjaars com QuickDocId aspx quickdoc 281 or   http   msdn microsoft com en-us library system web ui webcontrols listcontrol appenddatabounditems aspx

User · Answer

Like  Whisk  Said  the trick is in  AppendDataBoundItems  property  protected void Page Load object sender  EventArgs e        if   IsPostBack                DropDownList1 AppendDataBoundItems   true          DropDownList1 Items Insert 0  new ListItem String Empty  String Empty            DropDownList1 SelectedIndex   0            Thanks  Whisk

User · Answer

After your databind   drpList Items Insert 0  new ListItem String Empty  String Empty    drpList SelectedIndex   0

User · Answer

simple   at last   ddlProducer Items Insert 0

User · Answer

You could also have a union of the blank select with the select that has content   select    value     name union select value  name from mytable

[asp.net] Asp.net - Add blank item at top of dropdownlist

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