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Nullable GUIDs

Posted on 2008-10-17
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Last Modified: 2013-11-07
n my database, in one of the table I have a GUID column with allow nulls. I have a method with a Guid? parameter that inserts a new data row in the table. However when I say myNewRow.myGuidColumn = myGuid I get the following error: "Cannot implicitly convert type 'System.Guid?' to 'System.Guid'."
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Question by:iulianchira
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6 Comments
 
LVL 6

Expert Comment

by:divyeshhdoshi
ID: 22738708
please use guidcolumn= system.Guid.NewGuid()
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Author Comment

by:iulianchira
ID: 22738754
I do not want to a new GUID, i allready have the GUID I want to insert.
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LVL 6

Expert Comment

by:divyeshhdoshi
ID: 22738775
but in whatever guid it should have some value.
otherwise it will insert null in guid column.

like You have created a guid
System.Guid g=System.Guid.NewGuid()

you can not use this one
System.Guid g=new System.Guid() will create guid with blank.

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Author Comment

by:iulianchira
ID: 22738785
I want to have null sometimes in the column.
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Accepted Solution

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openshac earned 500 total points
ID: 22738791
Guid? and Guid are different types.
you need to cast the nullable guid before assigning it to a guid value:
myNonNullableGuid = (Guid)myNullableGuid;

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LVL 6

Expert Comment

by:openshac
ID: 22738803
or in your case
myNewRow.myGuidColumn = (Guid)myGuid ;

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