How to compare two rows in a single table and return change field and its value

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How to compare two rows in a single table and return change field and its value .

I am using Asp.net with linq.

Please give me exact idea how can i do it?

Posted 14-Mar-12 19:42pm

piushshukla

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Sergey Alexandrovich Kryukov 15-Mar-12 2:16am

How do you define "change field"?
--SA

ZurdoDev 15-Mar-12 8:04am

I believe OP means which fields have different values between the 2 rows.

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Vipin kumar.P · Accepted Answer · 2013-05-22T20:50:00

Please try the Following Sample code and change the Code according to your requirement

protected void Page_Load(object sender, EventArgs e)
        {
            //GetFiles(@"C:\Working");
            //BindGrid();
            getChangedRecords(CreateTable());
        }


public void getChangedRecords(DataTable DtInput)
        {

            DataTable dtTest = new DataTable("Change");
            dtTest.Columns.Add("Fieldname", typeof(String));
            dtTest.Columns.Add("RowNo", typeof(String));
            dtTest.Columns.Add("FieldValue", typeof(String));


            foreach (DataRow item in DtInput.Rows)
            {
                int index = DtInput.Rows.IndexOf(item);
                int iCount = item.ItemArray.Count();

                if (index != DtInput.Rows.Count-1)
                {
                    for (int i = 0; i < iCount; i++)
                    {
                        if (item[i].ToString() != DtInput.Rows[index + 1][i].ToString())
                        {
                            DataRow drTest = dtTest.NewRow();
                            drTest["Fieldname"] = DtInput.Columns[i].Caption;
                            drTest["RowNo"] = index;
                            drTest["FieldValue"] = item[i].ToString();

                            dtTest.Rows.Add(drTest);
                        }
                    }
                }
            }

        }






public DataTable CreateTable()
        {
            DataTable dtTest = new DataTable("Test");
            dtTest.Columns.Add("Col1", typeof(int));
            dtTest.Columns.Add("Col2", typeof(String));
            dtTest.Columns.Add("Col3", typeof(String));
            int iCount = 2;

            for (int i = 0; i < iCount; i++)
            {
                DataRow drTest = dtTest.NewRow();
                drTest["Col1"] = i;
                drTest["Col2"] = "Name";
                drTest["Col3"] = "Vipin" + i;

                dtTest.Rows.Add(drTest);
            }

            return dtTest;

        }