Empty string column in caml query

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Hi,

How can I filter all columns that are empty in caml query? here's my code;

XML

spSiteDataQuery = new SPSiteDataQuery();
                   spSiteDataQuery.Query = "<Where><Neq><FieldRef Name=\"ContentType\" /><Value Type=\"Text\">" + "</Value></Neq></Where>";
                   spSiteDataQuery.ViewFields = "<FieldRef Name=\"Title\"/>" + "<FieldRef Name=\"FileRef\" />" + "<FieldRef Name=\"Modified\"/>" + "<FieldRef Name=\"Created\"/>";
                   spSiteDataQuery.Lists = "<Lists ServerTemplate=\"850\"/>";
                   spSiteDataQuery.Webs = "<Webs Scope=\"Recursive\" />";

                   dtPages = spWeb.GetSiteData(spSiteDataQuery);

it throws exception in

XML

<value type ...></value>;

is

XML

<IsNull></IsNull>;

returns the same?

Posted 11-May-14 21:31pm

macmacmacmac

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Sayan Bera 12-May-14 5:47am

What is the value you are entering to check?
<value type="\"Text\">" + "</value>"
What is "+"?

macmacmacmac 12-May-14 6:17am

actually, I thought leaving no value in this parameters mean empty string. I just divided the string by using + sign

Sayan Bera 12-May-14 6:36am

"<Where><Eq>",
"<FieldRef Name='Time_x0020_of_x0020_Selection'/>",
"<Value Type='DateTime'><Today OffsetDays=’-0′></Value>",
"</Eq></Where>");

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