Compiler Error Message: CS1501: No overload for method ToString takes 1 arguments in ASP.Net

hi

in default.aspx page is label that show number like:

100,000.00

I want it show like:100,000

so I change code like below:

Label priceTotal = ddlQuantity.NamingContainer.FindControl("LblPriceT").ToString("N0") as Label;

but this error happen:

Compiler Error Message: CS1501: No overload for method 'ToString' takes 1 arguments Source Error:

Line 61:         quantity.Text = ddlQuantity.SelectedItem.Text.Trim() == "Select" ? "0" : ddlQuantity.SelectedItem.Text.Trim();
Line 62:         Label price = ddlQuantity.NamingContainer.FindControl("LblPrice") as Label;

Line 63:         Label priceTotal = ddlQuantity.NamingContainer.FindControl("LblPriceT").ToString("NO") as Label;

best regards

Neda