How to get a data type in C# .NET

private void timerShowItemsDetails_Tick(object sender, EventArgs e)
{
timerShowItemsDetails.Enabled = false;

if (treeViewGroups.Nodes.Count > 0)
{
TreeNode node = treeViewGroups.SelectedNode;
if (node != null)
{
if (node.Level == 1)
{
try
{
int Count = 0;
Array PropertyIDs;
Array Descriptions;
Array DataTypes;
ConnectedOPCServer.QueryAvailableProperties(node.Text,
out Count, out PropertyIDs,
out Descriptions, out DataTypes);
//
Array PropertyValues;
Array Errors;
ConnectedOPCServer.GetItemProperties(node.Text, Count,
ref PropertyIDs,out PropertyValues, out Errors);

DataTable dataTable = new DataTable();
// Columns
// Uses GetLowerBound and GetUpperBound in the for loop.
for (int i = Descriptions.GetLowerBound(0)-1; i <= Descriptions.GetUpperBound(0)-1; i++)
{
object obj = Descriptions.GetValue(i + 1);
DataColumn column = new DataColumn();
string columnName = (string)obj; // ((string)obj).Replace(" ","");
column.ColumnName = columnName;
object objectDataType = new object();
objectDataType = PropertyValues.GetValue(i + 1);
// Set data types for columns
column.DataType = objectDataType.GetType();
dataTable.Columns.Add(column);
}
// Rows
DataRow row = dataTable.NewRow();
for (int i = PropertyValues.GetLowerBound(0)-1; i <= PropertyValues.GetUpperBound(0)-1; i++)
{
object obj = PropertyValues.GetValue(i + 1);
row[dataTable.Columns.ColumnName] = obj;
}
dataTable.Rows.Add(row);
dataGridViewItemProperties.DataSource = dataTable;
}
catch (Exception ex)
{
string s = "Cannot get properties for item " + treeViewGroups.SelectedNode.Text + " : " + ex.Message;
eventLogMain.WriteEntry(s, EventLogEntryType.Error);
dataGridViewLog.Rows.Add(global::MegaOPCClient.Properties.Resources.Error, DateTime.Now, s);
}

}
}
}
}

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