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POhow to set a databound drop down list to allow empty string when it is bound to a primary key
 

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  1. POhow to set a databound drop down list to allow empty string when it is bound to a primary key
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    <p>Hi i have a drop down list that is populated by a table where the primary key is what determines the value of the item.</p> <p>How can i create an empty string item in the drop down list when the primary key of the datasource table does not allow nulls?</p> <p>basically i just want to allow the user of my application the choice of uploading a document or not which is currently not possible because the drop down list only shows items on the list with the default item already selected. </p> <p>I have managed to create an empty string in the drop down list but this does no good because the table requires a non null choice.</p> <p>thanks </p> <p>UPDATE</p> <p>I took out my try/catch statement and received this error!</p> <p>The INSERT statement conflicted with the FOREIGN KEY constraint "Network equipment - Attachments". The conflict occurred in database "Asset management System DB", table "dbo.Attachments", column 'AttachmentID'. The statement has been terminated.</p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMaster Yoda
    1. USMaster Yoda
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COThe database field is not nullable, yet you want the option of an empty value in the dropdown? Then you must perform client- (and perferably server- as well) side validation, to force the user to select a value.
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      1. POhow to set a databound drop down list to allow empty string when it is bound to a primary key
      1. USAlexander
 

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