Databases
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    <p>This is what I have now.</p> <pre><code>&lt;!-- language: lang-vb--&gt; Dim d As New DataTable() Dim c As New DataColumn("Size") c.DataType = GetType(Integer) Dim c2 As New DataColumn("SizeInUnits") c2.DataType = GetType(String) d.Columns.Add(c) d.Columns.Add(c2) Dim strFileSize As String = "" Dim di As New IO.DirectoryInfo("C:\temp") Dim aryFi As IO.FileInfo() = di.GetFiles("*.*") For Each fi As IO.FileInfo In aryFi Dim r As DataRow = d.NewRow() r(0) = fi.Length r(1) = GetSizeInUnits(fi.Length) d.Rows.Add(r) Next d.DefaultView.Sort = "Size ASC" DataGridView1.DataSource = d DataGridView1.Columns(0).Visible = False 'New Code Here, Don't Auto Sort. We will sort the data ourselves in event 'DataGridView1_ColumnHeaderMouseClick. You will have to do some additional work 'to determin the sort direction. i.e. If Current Sort Order is ASC, the sort DESC 'and vice versa DataGridView1.Columns(1).SortMode = DataGridViewColumnSortMode.Programmatic Private Sub DataGridView1_ColumnHeaderMouseClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.ColumnHeaderMouseClick DataGridView1.Sort(DataGridView1.Columns(0), System.ComponentModel.ListSortDirection.Descending) End Sub Private Function GetSizeInUnits(ByVal size As Double) As String Dim sizeKB As String = "KB" Dim sizeMB As String = "MB" Dim sizeGB As String = "GB" If (size &lt; 1000000) Then Return size / 1000 &amp; sizeKB End If If (size &gt; 1000000 AndAlso size &lt; 1000000000) Then Return size / 1000000 &amp; sizeMB End If If (size &gt; 1000000000) Then Return size / 1000000000 &amp; sizeGB End If End Function </code></pre>
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    1. POSorting DataGridView string column containing numbers and strings
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    1. COI'm using System.IO.FileInfo to generate a list of files and their attributes (into a datatable). This returns the file value in bytes which I pass through a function to convert it to a readable value before populating a column in the datatable.
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    2. COIf I may suggest another possible solution which would require only one column on DataTable. You could use a Dictionary Object. Using Lenght as Key and Unit Size as value. You could then sort the Dictionary to return a list in the order that you want. Iterate this list and add to the datatable.
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    3. COWill clicking the DataGridView header for SizeInUnits not remove the sort on the hidden column though?
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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