Populating Second DropDownList With Another DropDownList !

DropDownList2.DataSource = dt;
DropDownList2.DataValueField = dt.Columns["property_type"].ToString();
DropDownList2.DataTextField = dt.Columns["property_type"].ToString();
DropDownList2.DataBind();

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ShriKrishna Bhardwaj , With ASP.Net, SQL Server, Javascript