I have 2 Datatables that are quite similar but have other columnnames. The first Datatable has 4 columns and about 7000 records. The second one has also 4 columns and about 37000 records. Now i want to Display the records that are missing in the first Datatable in a third datagridview. How should I do this? I know there are a lot of code in the Internet about this but nothing has worked.
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Linq;
using System.Data.OleDb;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Input;
namespace Compare
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
DataTable ds;
DataTable dt;
public void btn_Click(object sender, EventArgs e)
{
SqlDataAdapter adapter = new SqlDataAdapter("select a.FALLZAHL, m.CODE, m.ANZ, m.STDAT From test m with (nolock) inner join test2 a with (nolock) on a.id = m.aid where m.STDAT >= '2016-01-01' and m.STALT = '6363' order by a.FALLZAHL", "Server = ada; Database = sd;Trusted_Connection = True");
ds = new DataTable(" ");
adapter.Fill(ds);
dataGridView1.DataSource = ds;
}
private void Excelsheet_Click(object sender, EventArgs e)
{
openFileDialog1.ShowDialog();
}
private void choose_Click(object sender, EventArgs e)
{
OpenFileDialog OpenFileDialog = new OpenFileDialog();
}
private string Excel03ConString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR={1}'";
private string Excel07ConString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR={0}'";
public void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
{
string filePath = openFileDialog1.FileName;
string extension = Path.GetExtension(filePath);
string header = radioButton1.Checked ? "YES" : "NO";
string conStr, sheetName, cells;
conStr = string.Empty;
switch (extension)
{
case ".xls": //Excel 97-03
conStr = string.Format(Excel03ConString, filePath, header);
break;
case ".xlsx": //Excel 07
conStr = string.Format(Excel07ConString, filePath, header);
break;
}
using (OleDbConnection con = new OleDbConnection(conStr))
{
using (OleDbCommand cmd = new OleDbCommand())
{
cmd.Connection = con;
con.Open();
System.Data.DataTable dtExcelSchema = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
sheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
con.Close();
}
}
using (OleDbConnection con = new OleDbConnection(conStr))
{
using (OleDbCommand cmd = new OleDbCommand())
{
using (OleDbDataAdapter oda = new OleDbDataAdapter())
{
dt = new DataTable();
cmd.CommandText = "SELECT * From [" + sheetName + "]";
cmd.Connection = con;
con.Open();
oda.SelectCommand = cmd;
oda.Fill(dt);
con.Close();
dataGridView2.DataSource = dt;
}
}
}
}
private void dataGridView3_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
/* dataGridView3.DataSource = from table1 in ds.AsEnumerable()
join table2 in dt.AsEnumerable() on table1.Field<int>("ColumnA") equals table2.Field<int>("ColumnA")
where table1.Field<int>("ColumnB") == table2.Field<int>("ColumnB") || table1.Field<string>("ColumnC") == table2.Field<string>("ColumnC") || table1.Field<object>("ColumnD") == table2.Field<object>("ColumnD")
select table1;
dataGridView3.DataSource = from table1 in ds.AsEnumerable()
where !dataGridView3.Contains(table1)
select table1;
*/
}
public void CompareData()
{
}
private void button1_Click(object sender, EventArgs e)
{
var dsRowCount = ds.AsEnumerable().Count();
var dtRowCount = dt.AsEnumerable().Count();
if (dsRowCount > dtRowCount)
{
//Set main table to be dt as this has the least number of rows.
dataGridView3.DataSource = NoMatches(dt, ds);
}
else
{
//Set main table to ds as this has the least number of rows OR tables have the same number of rows.
dataGridView3.DataSource = NoMatches(ds, dt);
}
}
private IEnumerable<DataRow> NoMatches(DataTable MainTable, DataTable SecondaryTable)
{
var matched = from table1 in MainTable.AsEnumerable()
join table2 in SecondaryTable.AsEnumerable()
on table1.Field<string>("ISH_FALLZAHL") equals table2.Field<string>("FAL")
where (table1.Field<string>("ML_CODE").Equals(table2.Field<string>("LST")))
|| Convert.ToInt32(table1.Field<Int16>("ML_ANZ")) == Convert.ToInt32(table2.Field<double>("ST"))
select table1;
return MainTable.AsEnumerable().Except(matched);
}
// dataGridView3.DataSource = CompareTables();
}
/* public bool DatatablesAreSame()
{
if (ds.Rows.Count == dt.Rows.Count)
return true;
foreach (DataColumn dc in ds.Columns)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
if (ds.Rows[i][dc.ColumnName = "ISH_FALLZAHL"] != dt.Rows[i][dc.ColumnName = "FAL"])
{
}
}
}
return true;
}
*/
/*
private void CompareTables()
{
try
{
var dt1Records = ds.AsEnumerable().Select(e1 => new { Id = e1["ISH_FALLZAHL"].ToString(), Name = e1["FAL"].ToString() });
var dt2Records = dt.AsEnumerable().Select(e2 => new { Id = e2["ISH_FALLZAHL"].ToString(), Name = e2["FAL"].ToString() });
var extraRecords = dt1Records.Except(dt2Records);
dataGridView3.DataSource = extraRecords;
}
catch (Exception ex)
{ }
}
*/
}
