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Tuesday, 14 November 2017

Where Clause in DataTable VB.Net and C#.Net

11/14/2017 - By Pranav Singh 0

This article will show you how you can apply where clause or filter in a datatable using c#.net and vb.net.

So for this article we will create a new console application to perform an example. So first we will have a datatable.

private static DataTable FillStudentData()
        {
            DataTable dtstudent = new DataTable();

            //Adding columns to table Emp
            DataColumn colEmpid = new DataColumn("RollNo", typeof(System.Int32));
            DataColumn colName = new DataColumn("Name", typeof(System.String));
            DataColumn colDept = new DataColumn("Address", typeof(System.String));

            //Adding columns to datatable
            dtstudent.Columns.AddRange(new DataColumn[] { colEmpid, colName, colDept });

            //Adding data
            dtstudent.Rows.Add(1, "John Smith Brown", "Address 1");
            dtstudent.Rows.Add(2, "Carry Brown", "Address 2");
            dtstudent.Rows.Add(3, "Candle Pencil", "Address 3");
            dtstudent.Rows.Add(4, "Graham Bell", "Address 4");
            dtstudent.Rows.Add(5, "Peter Kevin", "Address 5");

            return dtstudent;
        }

Now add the below code.

C#.NET:
DataTable dtstudent = new DataTable();
            dtstudent = FillStudentData();
            DataRow[] filterData1 = dtstudent.Select("RollNo=3");
            foreach (DataRow item in filterData1)
            {
                Console.WriteLine("Roll No : " + item.Field<int>("RollNo") + ", Name : " + item.Field<string>("Name") + ", Address : " + item.Field<string>("Address"));
            }

VB.NET:
Dim dtstudent As New DataTable()
dtstudent = FillStudentData()
Dim filterData1 As DataRow() = dtstudent.[Select]("RollNo=3")
For Each item As DataRow In filterData1
       Console.WriteLine("Roll No : " + item.Field(Of Integer)("RollNo") + ", Name : " + item.Field(Of String)("Name") + ", Address : " + item.Field(Of String)("Address"))
Next

In above code check the highlighted part of the code. In this I have used select and passed the value to check the record for roll no 3. So after execution we will get the below output.



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