The Select-command should look like this if you want to read A1 to D1:
SELECT * FROM [SHEETNAME_HERE$A1:D1]
Whole Code:
OleDbConnection con = new OleDbConnection(
"provider=Microsoft.Jet.OLEDB.4.0;data source="
+ XLS_FILE_NAME_AND_PATH_HERE
+ ";Extended Properties=Excel 8.0;");
StringBuilder stbQuery = new StringBuilder();
stbQuery.Append("SELECT * FROM [" + SHEETNAME_HERE + "$A1:D1]");
OleDbDataAdapter adp = new OleDbDataAdapter(stbQuery.ToString(), con);
DataSet dsXLS = new DataSet();
adp.Fill(dsXLS);
DataView dvEmp = new DataView(dsXLS.Tables[0]);
dataGridView1.DataSource = dvEmp;