Below link will give you details around
System.OverflowException.
OverflowException Class
Most probably your code throwing Exception on either of below lines.
east_Count = Convert.ToInt32(cmd.ExecuteScalar());
OR
east_Count += Convert.ToInt32(cmd.ExecuteScalar());<br />
Debug your code and see what values you are getting from
cmd.ExecuteScalar()
.
Also check, How many records you get when you execute your queries in MySQL Database Editor.