Updating the Database

Hi

I have fetched two database tables "MTQABenchMarks" and "Users" in the datagridview. This is a windows application. Now I have to update the "MTQABenchMark" database after making changes to the datatable present in the application. When I run the code it is throwing an exception "Dynamic SQL generation is not supported against multiple base tables." How to solve this. the code is

public Form1()
{
InitializeComponent();
}
static SqlConnection Con = new SqlConnection("Data Source= 192.168.100.234; Initial Catalog=gishyd; User ID=sa; password=gis*2005");

SqlDataAdapter Da = new SqlDataAdapter("SELECT dbo.Users.UserID, dbo.MTQABenchMark.Id as EmpID, dbo.Users.FirstName + ' ' + dbo.Users.LastName AS Name, dbo.MTQABenchMark.NoofMinPerDay,dbo.MTQABenchMark.PerMonth FROM dbo.Users INNER JOIN dbo.MTQABenchMark ON dbo.Users.UserID = dbo.MTQABenchMark.EID ", Con);
DataSet Ds = new DataSet();

private void Form1_Load(object sender, EventArgs e)
{
Da.Fill(Ds, "MTQABenchMark");
dataGridView1.DataSource = Ds.Tables["MTQABenchMark"];
}

private void button2_Click(object sender, EventArgs e)
{
SqlCommandBuilder CmdBld = new SqlCommandBuilder(Da);

Da.InsertCommand = CmdBld.GetInsertCommand();
Da.Update(Ds, "MTQABenchMark");

MessageBox.Show(" Database is Updated");
}

}
}