int  i =  0 跨度>; 
 do  
 {
 string  filename = ds.Tables [ 0 ]。行[i] [  FILENAME。跨度>]的ToString（）修剪（）; 
 i ++; 
 return  filename; 
}  while （i <  ds.Tables [ 0 跨度>] Rows.Count）; 

for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {

                    string filename = ds.Tables[0].Rows[i]["FILENAME"].ToString().Trim();

                    return filename;

                }

i have the above for loop i want to convert it to do while loop can any body help out.

int i = 0;
do
{
    string filename = ds.Tables[0].Rows[i]["FILENAME"].ToString().Trim();
    i++;
    return filename;
} while (i < ds.Tables[0].Rows.Count);