Error while submitting the query

Sorry, I am a beginner and it may be very basic question.

 

I have tested the below query and it does create a table and add all the contents from an excel file

 

SELECT *
INTO TEST_TABLE
FROM OPENROWSET('Microsoft.ACE.OLEDB.12.0',
'Excel 12.0; Database=D:\Vpath.xlsx; HDR=YES; IMEX=1',
'SELECT * FROM [Sheet1$]')
GO
 

I tried to do the same in visual studio with the below

 

 string str = @"D:\path.xlsx";
            string Str1 = "SELECT * INTO TEST_TABLE FROM OPENROWSET('Microsoft.ACE.OLEDB.12.0','Excel 12.0; Database=" + str + "; HDR = YES; IMEX = 1',' SELECT * FROM [Sheet1$]'";
           SqlConnection con = new SqlConnection("Connection...details");
            con.Open();
           SqlCommand cmd = new SqlCommand(Str1, con);
            SqlDataReader reader = cmd.ExecuteReader();
            cmd.ExecuteNonQuery();
            reader.Close();
            con.Close();

 

I get the below error

System.Data.SqlClient.SqlException: 'Incorrect syntax near ' SELECT * FROM [Sheet1$]'.'