Error Using Join To Access Sql Server Content

Why would this error? The join works in Query Analyzer.

GridViewShowA.Visible = true;
String objConnection = ConfigurationManager.ConnectionStrings["MyConnection"].ToString();
String strSQL = "SELECT x.office as Office, x.email as Email, z.fname as 'First Name', z.lname as 'Last Name', ";
strSQL += "z.title as Title ";
strSQL += "FROM db1.dbo.tblA X ";
strSQL += "JOIN db2.dbo.tblA Z ";
strSQL += " ON x.email = z.email";
strSQL += "WHERE x.office = '" + DropDownListoffice.SelectedValue.ToString() + "' ";
strSQL += "AND z.email = x.email";
SqlDataAdapter objAdapter = new SqlDataAdapter(strSQL, objConnection);
DataSet dataSet = new DataSet();
objAdapter.Fill(dataSet, "myData");
DataTable dataTable = dataSet.Tables[0];
GridViewShowA.DataSource = dataTable.DefaultView;
GridViewShowA.DataBind();

error:

Line 1: Incorrect syntax near 'x'.
Description: An unhandled exception occurred during the execution of the current web request.
Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Line 1: Incorrect syntax near 'x'.
Source Error:
Line 101:        objAdapter.Fill(dataSet, "myData");