How To Compare and delete datatable row using C#:

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I have two tables such as DTTable1 and DTTable2. It has the following records.

DTTable1:

 ItemID     Specification    Amount
---------  ---------------  ---------
   1             A             10
   1             B             20
   1             C             30

DTTable1:

 ItemID     Specification    Amount
---------  ---------------  ---------
   1             A             10
   1             B             20
   1             C             30
   2             A             10
   2             B             20
   3             A             10
   3             B             20

Here I want to compare these two tables. If DTTable1 records present in DTTable2(consider only ItemID) then remove the corresponding rows which has the ItemID same as DTTable1.

I have tried following codes but cant solve the problem.

Code snippet 1:

C#

foreach (DataRow DR in DTTable2.Rows)
{
   if (DR["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
   {
        DTTable2.Rows.Remove(DR);
   }
}
DTTable2.AcceptChanges();

It showed the error, "Collection was modified; enumeration operation might not execute". So I used For Loop, It also not given the desired result.

Code Snippet 2:

C#

for (int i = 0; i < DTTable2.Rows.Count; i++)
{
    if (DTTable2.Rows[i]["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
    {
        DTTable2.Rows.RemoveAt(i);
    }
}
DTTable2.AcceptChanges();

Code Snippet 3:

C#

List<datarow> rowsToDelete = new List<datarow>();
foreach (DataRow DR in DTTable2.Rows)
{
    if (DR["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
        rowsToDelete.Add(DR);           
}

foreach (var r in rowsToDelete)
    DTTable2.Rows.Remove(r);

Code Snippet 4:

C#

DTTable2.Rows
    .Where(DR => DR["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
    .ToList()
    .ForEach(r => DTTable2.Rows.Remove(r));

Code Snippet 5:

C#

for (int i = DTTable2.Rows.Count - 1; i >= 0; i--)
    if (DTTable2.Rows[i]["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
        DTTable2.Rows.RemoveAt(i);

Code Snippet 6:

C#

int i = 0;
while (i < DTTable2.Rows.Count)
{
    if (DTTable2.Rows[i]["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
        DTTable2.Rows.RemoveAt(i);
    else
        i++;
}

Code Snippet 7:

C#

var list = DTTable2.Rows.ToList();//create new list of rows
foreach (DataRow DR in list)
{
    //if bla bla bla
    DTTable2.Rows.Remove(DR);
}

Code Snippet 8:

C#

var result =  DTTable1.AsEnumerable()
                   .Where(row => !DTTable2.AsEnumerable()
                                         .Select(r => r.Field<int>("ItemID"))
                                         .Any(x => x == row.Field<int>("ItemID"))
                  ).CopyToDataTable();

Code snippet 9:

C#

for (int i = 0; i < DTTable2.Rows.Count; i++)
{
   if (DTTable2.Rows[i]["ItemID"].ToString() == DTTable1.Rows[i]["ItemID"].ToString())
   {
      cmd = new SqlCommand("DELETE FROM DetailsTB WHERE ItemID = '" + DTTable2.Rows[i]["ItemID"].ToString() + "' ", con1);
      cmd.ExecuteNonQuery();
   }
}

But sometimes, the second row doesn't remove from the table. I get the final DataTable as

 ItemID     Specification    Amount
---------  ---------------  ---------
   1             B             20
   2             A             10
   2             B             20
   3             A             10
   3             B             20

How to solve this? What is the simplest method to do this?
All above code cant work.
some data are not deleted from DTTable2 that are also match with DTTable1.
These are only Few method here I write but i tried more than 20 method to do the same.

Posted 22-Nov-13 7:18am

er.shoaib

Updated 29-Nov-20 2:27am

Nelek

v3

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agent_kruger · Answer 1 · 2013-11-23T00:03:00

in your code snipet 6:

Code Snippet 6:
 Collapse | Copy Code
int i = 0;
while (i < DTTable2.Rows.Count)
{
    if (DTTable2.Rows[i]["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
        DTTable2.Rows.RemoveAt(i);
    else
        i++;
}

try

Code Snippet 6:

for (int i=DTTable2.Rows.Count-1;i>=0;i--)
{
    if (DTTable2.Rows[i]["ItemID"].ToString() == DTTable1.Rows[0]["ItemID"].ToString())
        DTTable2.Rows.RemoveAt(i);
    else
        i++;
}

this might give you success

Karthik_Mahalingam · Answer 2 · 2013-11-22T07:44:00

try this code..

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace console_poc
{
    class Program
    {
        static void Main(string[] args)
        {
            DataTable DTTable1 = new DataTable();
            DTTable1.Columns.Add("ItemID", typeof(int));
            for (int i = 0; i <= 5; i++)   
                            DTTable1.Rows.Add(i);  // table 1 contains { 0,1,2,3,4,5,7}

            DataTable DTTable2 = new DataTable();
            DTTable2.Columns.Add("ItemID", typeof(int));
            DTTable2.Rows.Add(1);
            DTTable2.Rows.Add(5);
            DTTable2.Rows.Add(6); // table 2 contains { 1,5,6}

            var temp  = DTTable2.Copy();
            foreach (DataRow DR in temp.Rows)
            {
                int index = temp.Rows.IndexOf(DR);
                foreach (DataRow row in DTTable1.Rows) 
                if (DR["ItemID"].ToString() == row["ItemID"].ToString())
                {
                    DTTable2.Rows.RemoveAt(index);
                }
            }
            DTTable2.AcceptChanges();  // now table 2 contains  {6}
            
        
        }
    }
}

vijaymungara · Answer 3 · 2015-02-11T00:22:00

C#

for (int j = 0; j < DTTable2.Rows.Count; j++)
   {
      for (int m = 0; m < DTTable1.Rows.Count; m++)
       {
        if (DTTable2.Rows[m]["ItemID"].ToString() == DTTable1.Rows[j]                        ["ItemID"].ToString())
          {
              DTTable2.Rows.RemoveAt(m);
          }
       }
       DTTable2.AcceptChanges();
   }

How To Compare and delete datatable row using C#:

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