This function is in JavaScript.

This function will help to submit form when user press enter key at dropdownlist box.

//if enter key pressed at DropDownList

function onEnterpress(e)

{

//define any varible

var KeyPress

//if which property of event object is supported

if(e && e.which)

{

e = e

//character code is contained in NN4's which property

KeyPress = e.which

}

else

{

e = event

KeyPress = e.keyCode

}

//13 is the key code of enter key

if(KeyPress == 13)

{

//frmLogin is the name of form

document.frmLogin.submit()

return false

}

else

{

return true

}

}

After this just add the event in your code file at pageLoad like is:

Your code file may be in VB.NET or C# so you may add even like this.

ddlDropDownList.Attributes.Add("onKeyPress", "javascript:onEnterpress(event);")

Event is the name of event pressed by user at keyBoard Key.

ddlDropDownList is the name of dropdown on which we want to add event.