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Editorial Team
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Asked: 2026-05-31T17:51:48+00:00

I can read XLS file with this code : string path =@c:\r\1.xlsx; OleDbConnection MyConnection

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I can read XLS file with this code : 

string path =@"c:\r\1.xlsx";
OleDbConnection MyConnection = new OleDbConnection(@"provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + path + @"';HDR=Yes;Jet OLEDB:Engine Type=37");
OleDbDataAdapter MyCommand = new OleDbDataAdapter("select * from [Sheet1$]", MyConnection);
DataSet DtSet = new DataSet();
MyCommand.Fill(DtSet);
...
...

However – when I enhance the query to include some SQL Server commands like

 select *,case when 1=1 then 'a' else 'b' end as rr  from [Sheet1$]

it goes BANG

enter image description here

I know that OLEDB is using access jet/ace behind the scenes.

How can use pure T-SQL query here?

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1 Answer

  1. Editorial Team

    You have to use IIF in querying excel

    select *,
    IIF(1 = 1, 'a', 'b') as rr  
from [Sheet1$]

    And, to create a multiple case statement, just nest them, like this:

    select *,
    IIF(1 = 1, 'a', IIF( 2 = 2, 'c', 'b')) as rr  
from [Sheet1$]

    As to whether you can use a pure MSSQL query, I do not believe that any connection that you can use with excel supports the CASE statement. So, you will have to use the above solution

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