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POTreeview Loading Issue
 

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  1. POTreeview Loading Issue
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    <p>I am using TreeView in my project to hierarchical display of my data from database. It works fine for small amount of data, say 500 entries. But when it exceeds that number of entries, it is taking too much time for loading. I have to populate large amount of data (say 2500 entries). I have one table named as "tRegistered" from where I bind "Date" column as treeview Parent Node. And again from the same table I bind "Users" column as treeview Node. My objective is to display all registered users for the last 7 days in a hierarchical way. Please help me how do I proceed.</p> <p>My code is:</p> <pre><code>private void PopulateTreeView() { treeView1.Nodes.Clear(); SqlDataAdapter daPatient = new SqlDataAdapter("SELECT TOP 100 PERCENT pId, pDate, pName FROM tRegistered WHERE pDate &gt;= DATEADD(day,-7, GETDATE())", con); SqlDataAdapter daDate = new SqlDataAdapter("SELECT TOP 100 PERCENT pDate FROM tRegistered WHERE pDate &gt;= DATEADD(day, - 7, GETDATE())) GROUP BY pDate ORDER BY pDate DESC", con); DataSet ds = new DataSet(); daPatient.Fill(ds, "tRegistered"); daDate.Fill(ds, "tRegistered"); //Add root node TreeNode root = new TreeNode("Registered"); treeView1.Nodes.Add(root); //Hard code ds.Relations.Add("Regsd", ds.Tables["tRegistered"].Columns["pDate"], ds.Tables["tRegistered"].Columns["pDate"]); foreach (DataRow dr in ds.Tables["tRegistered"].Rows) { DateTime dt = Convert.ToDateTime(dr["pDate"]); TreeNode tn = new TreeNode(String.Format("{0:dd-MMM-yyyy}", dt)); foreach (DataRow drChild in dr.GetChildRows("Regsd")) { TreeNode childTn = new TreeNode(drChild["pId"].ToString() + "- " + drChild["pName"].ToString()); childTn.Tag = drChild["pId"]; tn.Nodes.Add(childTn); } root.Nodes.Add(tn); root.Expand(); } } </code></pre>
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    1. COCall the treeview's BeginUpdate() method first, EndUpdate() when you are done.
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      1. USHans Passant
 

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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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