SaveFileDialog question

I have a file stored on a SQL server. I want the user to click a button and get asked where they would like to store that file and then save it there. I thought a savefiledialog would be the best but have never used it before. Currently I have this code and it saves the file but always in the same location.

id = the selected primary key in a listview
FileName = the filename stored in the SQL database

Code:

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SqlConnection con = new SqlConnection("Server=Darkover;uid=<username>;pwd=<strong password>;database=northwind");
SqlDataAdapter da = new SqlDataAdapter("Select * From MyImages where DocID = ' " + id + "'", con);
SqlCommandBuilder MyCB = new SqlCommandBuilder(da);
DataSet ds = new DataSet("MyImages");

byte[] MyData= new byte[0];
                       
da.Fill(ds, "MyImages");
DataRow myRow;
myRow=ds.Tables["MyImages"].Rows[0];
         
MyData =  (byte[])myRow["imgField"];
int ArraySize = new int();
ArraySize = MyData.GetUpperBound(0);
String Filename;
Filename = (string)myRow["FileName"];
FileStream fs = new FileStream(@"C:\temp\" + Filename, FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(MyData, 0,ArraySize);
fs.Close();
}

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The SaveFileDialog is merely an interface to allow the user to select a location for saving a file. It's then up to you to do the saving. The path selected by the user is returned by the SFD's FileName property, so you use that as the path to which your code saves the file.

But they can choose the filename or can you lock that out so the cannot enter any info. I know I could just take the path and add my filename but if they are expecting the filename they put then it could be confusing for them.

If you want the user to select a folder then use the FolderBrowserDialog, not the SaveFileDialog.