how to change telerik grid's SelfHierarchySettings Maximumdepth value in code behind dynamically

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ASP.NET

grid

Telerik

If gave maximum depth value as static in aspx page it`s working fine.

<SelfHierarchySettings ParentKeyName="XXXXXXXXXX" KeyName="XXXXXXXX" MaximumDepth="5"/>

But when i try to change this dyanmically in .cs page it`s not working.
In which event i have to write the following code?

grdView.MasterTableView.SelfHierarchySettings.MaximumDepth = Convert.ToInt32(txt_DepNo.Text);