C#

foreach (DataRow dataRow in dt.Rows)
            {
                if (dataRow["Column1"].ToString().Contains(["ExampleString"])
                {
                    
                    listBox1.Items.Add(dataRow["Column1"] + " " + dataRow["Column2"] + "  " + dataRow["Column3"] + " " + dataRow["Column4"]);

                }
            }


//the above code works perfectly and returns only the rows containing the "ExampleString"


// if i try to use a SelectedText value from a combobox as a string to replace the "ExampleString", (as shown below),the listbox populates with ALL of the rows, not just the ones with the "ExampleString".  




string strFromCombobox = comboBox1.SelectedText;

foreach (DataRow dataRow in dt.Rows)
            {
                if (dataRow["Column1"].ToString().Contains(strFromCombobox)
                {
                    
                    listBox1.Items.Add(dataRow["Column1"] + " " + dataRow["Column2"] + "  " + dataRow["Column3"] + " " + dataRow["Column4"]);

                }
            }

class Program
{
    public static void Main()
    {
        while (true)
        {
            Console.WriteLine("Welcome");
            Console.WriteLine("1 to go to Data class");
            Console.WriteLine("type q to exit");
            string input = Console.ReadLine();
            if (input == "1")
            {
                // What should I type here ????
            }
            else if (input == "q")
            {
                break;
            }
            else
            {
                Console.WriteLine("invalid option");
            }
        }
    }
}

class Data
{
    public Data()
    {
        while (true)
        {
            Console.WriteLine("Choose Option : ");
            Console.WriteLine("Press 1 to add and Press 2 To Go to Main Program");
            int entry = int.Parse(Console.ReadLine());
            if (entry == 1)
            {
                Console.WriteLine("Enter any number ");
                int input = int.Parse(Console.ReadLine());
                int result = input += 3;
                Console.WriteLine("result");
                Console.WriteLine(result);
            }
            else if (entry == 2)
            {
            }
            else
            {
                Console.WriteLine("Invalid OPtion");

            }
            break;
        }
    }
}