How to import data from Excel sheet to data Table in c#?

Question

I am using Asp.net with C#. I need to import data from an Excel sheet to a DataTable. The sheet has 100,000 records with four columns: Firstname, LastName, Email,Phone no.

How can I do this?

Solution

Use the following code:

public static DataTable exceldata(string filePath)
    {     
        DataTable dtexcel = new DataTable();
           bool hasHeaders = false;
            string HDR = hasHeaders ? "Yes" : "No";
            string strConn;
            if (filePath.Substring(filePath.LastIndexOf('.')).ToLower() == ".xlsx")
                strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=\"Excel 12.0;HDR=" + HDR + ";IMEX=0\"";
            else
                strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties=\"Excel 8.0;HDR=" + HDR + ";IMEX=0\"";
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            DataTable schemaTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
            //Looping Total Sheet of Xl File
            /*foreach (DataRow schemaRow in schemaTable.Rows)
            {
            }*/
            //Looping a first Sheet of Xl File
            DataRow schemaRow = schemaTable.Rows[0];
            string sheet = schemaRow["TABLE_NAME"].ToString();
            if (!sheet.EndsWith("_"))
            {
                string query = "SELECT  * FROM [" + sheet3 + "]";
                OleDbDataAdapter daexcel = new OleDbDataAdapter(query, conn);
                dtexcel.Locale = CultureInfo.CurrentCulture;
                daexcel.Fill(dtexcel);
            }

        conn.Close();
        return dtexcel;

    }

Source: http://www.codeproject.com/Questions/445400/Read-Excel-Sheet-Data-into-DataTable

You may also refer the following question: Importing Excel into a DataTable Quickly if you wish to import faster.

Comments

[Joel Coehoorn]

This can work, but it requires MS Office to be installed on the web server and will literal open an instance of excel behind the scenes for every http request where this is used.