C#

string path;
StringBuilder sb = new StringBuilder();
char c;
char[] temp = new char[10];
Boolean munching = true;

if (txtFilePath.Text != "" && txtFilePath.Text != null)
{
    path = txtFilePath.Text;

    if (File.Exists(path))
    {
        FileStream fs = new FileStream(@"C:\test.pdf", FileMode.Open);
        BinaryReader br = new BinaryReader(fs);

        while (munching == true)
        {
            br.Read(temp, 0, 10);
            c = temp[0];
        }

    }
    else
    {
        // tell the user to wake up
    }
}
else
{
    // tell the user to wake up
}

Create Procedure MultiTable
As
Begin
     Select Name, Email from A
     Select X,Y         from B
     Select J, K        from C
End

SqlConnection conn = new SqlConnection("Con String");
SqlDataAdapter da = new SqlDataAdapter("MultiTable",conn);
da.SelectCommand.CommandType = CommandType.StoredProcedure;

DataSet ds = new DataSet();
da.Fill(ds);