Get data from SQL along with read excel in C#

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Hi, I have a program that are able to import an excel file to datatable binding with datagridview. Currently I need to add another column name InvtID and get that InvtID data from sql based on Barcode column that I have been imported.

How am I able to achieve this one as right now my coding are able to get the data AFTER import an excel, so the column data are not in side-by-side with Barcode column. This is the only problem I encounter to finish this task, please help me.

What I have tried:

public void filldatagridview(ExcelWorksheet workSheet)
       {
           DataTable dt = new DataTable();

           //Create the data column
           for (int col = workSheet.Dimension.Start.Column; col <= workSheet.Dimension.End.Column; col++)
           {
               dt.Columns.Add(col.ToString());
           }

          for (int row = 12; row <= 26; row++)
           {
               DataRow newRow = dt.NewRow(); //Create a row
               int i = 0;
               for (int col = workSheet.Dimension.Start.Column; col <= workSheet.Dimension.End.Column; col++)
               {
                   newRow[i++] = workSheet.Cells[row, col].Text;
               }
               dt.Rows.Add(newRow);
           }

           dt.Columns.RemoveAt(0); //remove No
           dt.Columns.RemoveAt(0); //remove article

      //Get BookCode
      using (SqlConnection conn = new SqlConnection("Server"))
      using (SqlCommand cmd = new SqlCommand(null, conn))
     {
    StringBuilder sb = new StringBuilder("WITH cte AS(SELECT case WHEN InvtID IS NULL OR InvtID='' THEN 'No Bookcode Found' ELSE InvtID END AS InvtID,Barcode,ROW_NUMBER() OVER(PARTITION BY Barcode ORDER BY InvtID Asc) rid FROM InventoryCustomer) SELECT InvtID AS BOOKCODE FROM cte WHERE rid=1 and Barcode In (");
             for (int i = 0; i < dt.Rows.Count; i++)
              {
                 if (i != 0) sb.Append(",");
                  string name = "@P" + i;
                  cmd.Parameters.AddWithValue(name, dt.Rows[i]["3"]); //"3" is barcode column
                  sb.Append(name);
              }
              sb.Append(") ORDER BY Barcode Asc");
              cmd.CommandText = sb.ToString();
              SqlDataAdapter da = new SqlDataAdapter(cmd);
              da.Fill(dt);

              dt.Columns["BOOKCODE"].SetOrdinal(0);
              dataGridView2.DataSource = dt;
           }
      }

Posted 6-Feb-19 13:49pm

Member 14127871

Updated 6-Feb-19 20:27pm

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Maciej Los · Answer 1 · 2019-02-06T20:27:00

I'll do that this way:
1) create DataSet[^] (ds)
//Excel
2) create OleDbConnection[^] to Excel file
3) create OleDbCommand[^] to grab data from Excel
4) load data into DataTable[^] (dt1) object via OleDbDataReader[^]
5) add dt1 object to ds
//SQL Server
6) create SqlConnection[^] to SQL database
7) create SqlCommand[^] to grab data from SQL server
8) load data into DataTable (dt2) object via SqlDataReader[^]
9) add dt2 to ds
//final job
10) join data via Linq:

C#

	string sFileName = @"D:\yourExcelFile.xlsx";
	string sConStr = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0;HDR=YES';", sFileName);

        string sSqlConn = "enter connection details to SQL server";
	//create dt1 and dt2 to be able to use them later
	DataTable dt1 = new DataTable();
	DataTable dt2 = new DataTable();
	
	//1.
	DataSet ds = new DataSet();
	//2.
	using (OleDbConnection connection = new OleDbConnection(sConStr))
	{
		string sql = @"SELECT * FROM [Sheet1$];";
		connection.Open();
		//3.
		using(OleDbCommand command = new OleDbCommand(sql, connection))
		{
		    //4.
                    using (OleDbDataReader reader = command.ExecuteReader())
		    {
		        dt1.Load(reader);
		    }
		}
		//5.
		ds.Tables.Add(dt1);
		//clean up
		command.Dispose();
	}

	//6.

	using (SqlConnection connection = new SqlConnection(sSqlConn))
	{
		string sql = @"SELECT * FROM YourTable";
		connection.Open();
		//7.
		using(SqlCommand command = new SqlCommand(sql, connection))
		{
		    //8.
		    using(SqlDbDataReader reader = command.ExecuteReader())
		    {
		        dt2.Load(reader);
		    }
		}
		//9.
		ds.Tables.Add(dt2);
		//clean up
		command.Dispose();
	}

//10.
var commonData = (from r1 ds.Tables("dt1").AsEnumerable()
    join r2 ds.Tables("dt1").AsEnumerable() on r1.Field<string>("Barcode") equals r1.Field<string>("Barcode"))
    .Select(x=>new
    {
        A = r1.Field<Type>("Name1"),
        B = r1.Field<Type>("Name2"),
        C = r1.Field<Type>("Name3"),
        //second datatable data 
        D = r2.Field<Type>("Name1")
    })
    .ToList();

//open Excel file and dump data into it!
foreach(var row in commonData)
{
    //your logic here...
   
}

Note: above code has been writen direct from my head, so it can contains errors.

Good luck!