insert radio button selected item to database

Use the following code and debug and check thw value of price variable

protected void ImageButton2_Click1(object sender, ImageClickEventArgs e)
    {
        string data = Server.UrlDecode(Request.QueryString["BehCode3"]);
 
        string price = RadioButton2.Checked ? TextBox1.Text : "noprice";
        SqlCommand _cmd = new SqlCommand("insertproduct", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;
        _cn.Open();
 
        _cmd.Parameters.AddWithValue("@Name", txtname.Text);
        _cmd.Parameters.AddWithValue("@Model", txtmodel.Text);
        _cmd.Parameters.AddWithValue("@Price", price);
        _cmd.Parameters.AddWithValue("@behcode", data);
        _cmd.ExecuteNonQuery();
 
        _cn.Close();
    }

ALTER procedure [dbo].[insertproduct]
@Name nvarchar(30),@Model nvarchar(30),@Behcode nvarchar(10)
,@price nvarchar(30)
 
as
begin
insert into House_p (Name,Model,Price,Date,BehCode)
values (@Name,@Model,@price,GETDATE(),@Behcode)
end