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Hello every one, I am getting an error while importing data from excel sheet and binding that data to grid view.
Error: Could not find installable ISAM.

I think problem is in connection string.
This is my code:
string path = fileupload.PostedFile.FileName;
           string strmail = string.Empty;
           string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 8.0;HDR=YES;ReadOnly=False;";
            OleDbConnection objConn = new OleDbConnection(connectionString);
            objConn.Open();//Here is the error
Posted 1-Feb-13 2:15am
Updated 1-Feb-13 2:17am
CHill60 1-Feb-13 8:22am
What is path actually set to ? Try putting quotes around it
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Solution 4


check the below code
public DataSet GetDataFromExcel(string filePath)
    string strConn;
    strConn = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filePath + ";" + "Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1;TypeGuessRows=0;ImportMixedTypes=Text\"";
    DataTable dt = new DataTable();
    dt = null;
    using (OleDbConnection oleDB = new OleDbConnection(strConn))
        dt = oleDB.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
        if (dt == null)
            return null;

        ListItemCollection items = new ListItemCollection();
        int i = 0;

        //if (dt.Rows.Count > 1)
        //return null;  

        for (int rowIndex = 0; rowIndex < dt.Rows.Count; rowIndex++)
            string excelSheetName;
            string lastCharacter = "";

            excelSheetName = dt.Rows[rowIndex]["TABLE_NAME"].ToString();
            excelSheetName = excelSheetName.Replace("'", "");
            lastCharacter = excelSheetName.Substring(excelSheetName.Length - 1, 1);
            if (lastCharacter == "$")
        if (items.Count > 1)
            return null;

        string sName;
        string query;

        sName = items[0].ToString();
        sName = sName.Replace("'", "");
        sName = sName.Replace("$", "");

        query = "";
        query = String.Format("select * from [{0}$]", sName);
        OleDbDataAdapter da = new OleDbDataAdapter(query, strConn);
        DataSet ds = new DataSet();
        return ds;

    catch (Exception ex)

        throw ex;

public static DataSet ImportExceltoDataset(string file)
    IExcelDataReader iExcelDataReader = null;

    FileStream oStream = File.Open(file, FileMode.Open, FileAccess.Read);

    iExcelDataReader = ExcelReaderFactory.CreateBinaryReader(oStream);

    iExcelDataReader.IsFirstRowAsColumnNames = true;

    DataSet dsUnUpdated = new DataSet();

    dsUnUpdated = iExcelDataReader.AsDataSet();


    return dsUnUpdated;
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Solution 1

OleDbCommand command = new OleDbCommand("SELECT * FROM [Sheet1$]", connection);

for more info check my blog here[^]
bapu_reddy 1-Feb-13 9:00am
I have modified the code as per ur suggestions. But getting the following error -- "External table is not in the expected format". So what should be the format. please help me. Thanks in advance.
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Solution 2

Problem is regarding provider Microsoft.ACE.OLEDB.12.0
it is found in your system

you can use with .xls

string connectionstring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\" + file + ".xls;Extended Properties=Excel 8.0;";

Source : Database Connection c# with sql/acess/excel[^]
Hemant Singh
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Solution 3

Please change your connection string like below
ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" App.Path & "\..\Upload" & ExcelFileName & ".xls" & ";Extended Properties=""Excel 8.0;HDR=NO;IMEX=1"""

Hope this helps

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