Hi Vijay,
Thanks for contacting Syncfusion forums.
We have checked the code provided by you and found that “AutoPostBack” property was not enabled to retrieve the updated text from AutoCompleteTextBox. Kindly enable this property and the text. Please refer the code given below to achieve this,
[ASPX]
Width="200px" OnProvideChoiceListOnCallback="AutoCompleteTextBox1_ProvideChoiceListOnCallback1" AutoPostBack="true"
DDBackColor="MintCream" DDcssClass="SelectionClass" >
We have also prepared a sample to depict this behavior and the sample can be downloaded from the following link,
autocomplete142004666.zipKindly try the sample and let us know if it helps.
Regards,
Varalakshmi