How to Update certain column data of dataTable from another datatable

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I have 2 DataTables
1. DTForQueNewEntry
2. dtFinal

I need to write a code which does the work like following query

SQL

update DTForQueNewEntry SET DTForQueNewEntry.OptionSet = dtFinal.OptionSet

where DTForQueNewEntry.Point_Mapping_Sr= dtFinal.Point_Mapping_Sr AND
    DTForQueNewEntry.Question_Name = dtFinal.Question_Name

where OptionSet, Point_Mapping_Sr, Question_Name are Columns present in both DataTables

Thanks in Advance

Posted 24-May-13 2:03am

maverick12131

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2 solutions

Solution 1

There are two possibility :-

1. Create a SP for the query you have mentioned and call it in your code.

C#

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Databasename"].ConnectionString); {
    using (SqlCommand cmd = new SqlCommand("sp_Name;, con)) {
      cmd.CommandType = CommandType.StoredProcedure;

      con.Open();
      cmd.ExecuteNonQuery();

2. Call the query as it is in your code.

C#

 SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Databasename"].ConnectionString);
 SqlCommand cmd1 = new SqlCommand("update DTForQueNewEntry SET DTForQueNewEntry.OptionSet = dtFinal.OptionSet 
where DTForQueNewEntry.Point_Mapping_Sr= dtFinal.Point_Mapping_Sr AND
    DTForQueNewEntry.Question_Name = dtFinal.Question_Name");
 con.Open();
cmd1.ExecuteNonQuery();
con.Close();

- NP

Posted 24-May-13 2:55am

Nirav D Parmar

Comments

maverick12131 26-May-13 15:46pm

Those are not tables in the database. Those are DataTables in C#
Can you please guide me accordingly

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maverick12131 · Accepted Answer · 2013-05-26T21:56:00

I did the following which solved the issue. Thanks

C#

DataRow[] drs = dtWithScore.Select("OptionSet = 'true'");
       DataTable dtFinal = dtWithScore.Clone();
       foreach (DataRow d in drs)
       {
           dtFinal.ImportRow(d);
       }
       for (int i = 0; i < dtFinal.Rows.Count; i++)
       {
           Int64 intPoint_Mapping_Sr = Convert.ToInt64(dtFinal.Rows[i]["Point_Mapping_Sr"]);
           string strQuestionOptions_OptionName = dtFinal.Rows[i]["QuestionOptions_OptionName"].ToString();
           DataRow[] drToupdate = DTForQueNewEntry.Select("Point_Mapping_Sr = " + intPoint_Mapping_Sr + " AND QuestionOptions_OptionName = '" + strQuestionOptions_OptionName + "'");

           drToupdate[0]["OptionSet"] = true;

       }