.Net Tip : Intersect or find common records or find duplicate records of Two LINQ queries with C# Examples and VB.Net Examples

You can get Intersect of two LINQ query or Results.
Intersect means find common records between two LINQ results.
You can also say find duplicate records from two LINQ query or Results.
In this example we find duplicate records from two DataTable using LINQ.

Here is example of this.
In this example we execute two different LINQ Query on DataTable and find two different results object.
After that we find common records from these two results.

C# Examples :

        DataSet ds = new DataSet();
        DataTable dt = new DataTable();
        DataColumn dc;
        DataRow dr;
        ds.DataSetName = "products";
        dt.TableName = "product";

        dc = new DataColumn("product_id",long.MaxValue.GetType());
        dt.Columns.Add(dc);

        dc = new DataColumn("product_name");
        dt.Columns.Add(dc);

        dr = dt.NewRow();
        dr["product_id"] = 1;
        dr["product_name"] = "Monitor";
        dt.Rows.Add(dr);

        dr = dt.NewRow();
        dr["product_id"] = 2;
        dr["product_name"] = "Mouse";
        dt.Rows.Add(dr);

        dr = dt.NewRow();
        dr["product_id"] = 3;
        dr["product_name"] = "KeyBoard";
        dt.Rows.Add(dr);

        dr = dt.NewRow();
        dr["product_id"] = 4;
        dr["product_name"] = "LCD";
        dt.Rows.Add(dr);

        ds.Tables.Add(dt);

        IEnumerable<DataRow> objResult1 = from tbl in dt.AsEnumerable()
                                       where tbl.Field<long>(0) >=3
                                       select tbl;

        Response.Write("<b>Query Results 1</b>");
        foreach (DataRow row in objResult1)
        {
            Response.Write(string.Format("<br/>Product ID: {0} ,  Product Name: {1}", row.Field<long>(0), row.Field<string>(1)));
        }

        IEnumerable<DataRow> objResult2 = from tbl in ds.Tables[0].AsEnumerable()
                                       let product_name = tbl.Field<string>(1)
                                       where product_name.StartsWith("Key")
                                       || product_name.StartsWith("Mo")
                                       select tbl;

        Response.Write("<br/><br/><b>Query Results 2</b>");
        foreach (DataRow row in objResult2)
        {
            Response.Write(string.Format("<br/>Product ID: {0} ,  Product Name: {1}", row.Field<long>(0), row.Field<string>(1)));
        }


        IEnumerable<DataRow> objIntersectResult = objResult1.Intersect(objResult2);

        Response.Write("<br/><br/><b>Intersect Query Results</b>");
        foreach (DataRow row in objIntersectResult)
        {
            Response.Write(string.Format("<br/>Product ID: {0} ,  Product Name: {1}", row.Field<long>(0), row.Field<string>(1)));
        }
        Response.Write("<br/><br/>");

VB.net Examples :

        Dim ds As New DataSet()
        Dim dt As New DataTable()
        Dim dc As DataColumn
        Dim dr As DataRow
        ds.DataSetName = "products"
        dt.TableName = "product"

        dc = New DataColumn("product_id", Long.MaxValue.GetType())
        dt.Columns.Add(dc)

        dc = New DataColumn("product_name")
        dt.Columns.Add(dc)

        dr = dt.NewRow()
        dr("product_id") = 1
        dr("product_name") = "Monitor"
        dt.Rows.Add(dr)

        dr = dt.NewRow()
        dr("product_id") = 2
        dr("product_name") = "Mouse"
        dt.Rows.Add(dr)

        dr = dt.NewRow()
        dr("product_id") = 3
        dr("product_name") = "KeyBoard"
        dt.Rows.Add(dr)

        dr = dt.NewRow()
        dr("product_id") = 4
        dr("product_name") = "LCD"
        dt.Rows.Add(dr)

        ds.Tables.Add(dt)

        Dim objResult1 As IEnumerable(Of DataRow) = From tbl In dt.AsEnumerable()
                                      Where tbl.Field(Of Long)(0) >= 3
                                      Select tbl

        Response.Write("<b>Query Results 1</b>")
        For Each row As DataRow In objResult1
            Response.Write(String.Format("<br/>Product ID: {0} ,  Product Name: {1}", row.Field(Of Long)(0), row.Field(Of String)(1)))
        Next

        Dim objResult2 As IEnumerable(Of DataRow) = From tbl In ds.Tables(0).AsEnumerable()
                                    Let product_name = tbl.Field(Of String)(1)
                                    Where product_name.StartsWith("Key") Or product_name.StartsWith("Mo")
                                    Select tbl

        Response.Write("<br/><br/><b>Query Results 2</b>")
        For Each row As DataRow In objResult2
            Response.Write(String.Format("<br/>Product ID: {0} ,  Product Name: {1}", row.Field(Of Long)(0), row.Field(Of String)(1)))
        Next

        Dim objIntersectResult As IEnumerable(Of DataRow) = objResult1.Intersect(objResult2)

        Response.Write("<br/><br/><b>Intersect Query Results</b>")
        For Each row As DataRow In objIntersectResult
            Response.Write(String.Format("<br/>Product ID: {0} ,  Product Name: {1}", row.Field(Of Long)(0), row.Field(Of String)(1)))
        Next
        Response.Write("<br/><br/>")

Output : 

 

This type of C# Tips is very useful in day to day programming life.

Note : Give Us your valuable feedback in comments. Give your suggestions in this article so we can update our articles accordingly that.