Cannot change ReadOnly property for the expression column

I have a data table which I add a boolean column to.  When I later in the code try to change a value, I get an error that the column is read only.  


dt.Columns.Add("Flag", GetType(Boolean), "False")
.
.
.
Later, in my code
dt.Rows(z)("Flag") = True  '  ==>  Errors - 'Flag' is read only

So, I tried to add ReadOnly = False in my column add code, but I get Cannot change ReadOnly property for the expression column error:

dt.Columns.Add("Flag", GetType(Boolean), "False").ReadOnly = False

robjayAsked:
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jbeasle3Commented:
Try doing this:  it seems to work where entering the expression in the add function doesn't

dc = New DataColumn("Flag", GetType(Boolean))
dc.DefaultValue = False
dt.Columns.Add(dc)
.
.
dt.Rows(0)("Flag") = True
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guru_samiCommented:
Add datacolum like this:
DataColumn dtc = new DataColumn();
            dtc.ColumnName = "Flag";
            dtc.DataType = System.Type.GetType("System.Boolean");
            dtc.ReadOnly = false;
            dt.Columns.Add(dtc);
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robjayAuthor Commented:
Just had to also add
Dim dc as New Data.DataColumn
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