Hello Vaghela,
Thank you for writing.
Following the provided brief description, I have tried to reproduce the problem on my end with the latest version but without any success. Please find attached a sample gif file, illustrating the load time in milliseconds for the drop down. It takes less than a second. Here is my sample code snippet:
public Form1()
{
InitializeComponent();
DataTable dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Title", typeof(string));
dt.Columns.Add("Type", typeof(int));
Random rand = new Random();
for (int i = 0; i < 10; i++)
{
dt.Rows.Add(i, "Title" + i, rand.Next(0, 2000));
}
this.radGridView1.AutoGenerateColumns = false;
GridViewDecimalColumn decimalColumn = new GridViewDecimalColumn("ID column");
decimalColumn.FieldName = "Id";
this.radGridView1.MasterTemplate.Columns.Add(decimalColumn);
GridViewTextBoxColumn textBoxColumn = new GridViewTextBoxColumn("Title column");
textBoxColumn.FieldName = "Title";
this.radGridView1.MasterTemplate.Columns.Add(textBoxColumn);
DataTable comboSource = new DataTable();
comboSource.Columns.Add("Id", typeof(int));
comboSource.Columns.Add("Description", typeof(string));
for (int i = 0; i < 2000; i++)
{
comboSource.Rows.Add(i, "Type" + i);
}
GridViewComboBoxColumn comboColumn = new GridViewComboBoxColumn("Type column");
comboColumn.DataSource = comboSource;
comboColumn.ValueMember = "Id";
comboColumn.DisplayMember = "Description";
comboColumn.FieldName = "Type";
this.radGridView1.Columns.Add(comboColumn);
this.radGridView1.DataSource = dt;
this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;
this.radGridView1.CellEditorInitialized += radGridView1_CellEditorInitialized;
}
Stopwatch sw;
private void radGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
{
if (e.Column.Name == "Type")
{
RadDropDownListEditor ddl = e.ActiveEditor as RadDropDownListEditor;
if (ddl != null)
{
sw = new Stopwatch();
sw.Start();
RadDropDownListEditorElement element = ddl.EditorElement as RadDropDownListEditorElement;
element.PopupOpened -= element_PopupOpened;
element.PopupOpened += element_PopupOpened;
}
}
}
private void element_PopupOpened(object sender, EventArgs e)
{
sw.Stop();
RadMessageBox.Instance.StartPosition = FormStartPosition.CenterScreen;
RadMessageBox.Show("Load Time: " + sw.ElapsedMilliseconds);
}
Feel free to modify it on a way to reproduce the issue you are facing and get back to me with it so I can investigate the precise case and assist you further. Thank you in advance.
I am looking forward to your reply.
Regards,
Desislava
Telerik
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