HOW TO CONVERT LIST OF STRING INTO COMMA SEPARATED STRING IN ASP.NET C#

Description:  Here I have demonstrated two different methods to create a comma separated list from List<string>. In first method I have used StringBuilder and in second I have used string.join method to convert the list of string into comma delimited string. Here in this example I have used comma as a delimiter but we can use any delimiter to separate the list of string.

Implementation: Let’s create a sample page from demonstration purpose.

Asp.Net C# Code:

First Method: Using StringBuilder to concatenate list of strings separated by comma

protected void Page_Load(object sender, EventArgs e)

    {

        //Create a List of string and add items

        List<string> str = new List<string>();

        str.Add("Sonam");

        str.Add("Kabeer");

        str.Add("Simran");

        str.Add("Arjun");

        str.Add("Randeep");

        //Get Comma Separated String from List of strings

        string Result = GeDelimmetedString(str, ", ");

        Response.Write(Result);

};

 Private string GeDelimmetedString(List<string> strList, string delimiter)

    {

       System.Text.StringBuilder sb = new System.Text.StringBuilder();

        foreach (string str in strList)

        {

            if (sb.Length > 0)

            {

                sb.Append(delimiter);

            }

            sb.Append(str);

        }

        return sb.ToString();

    }

Second Method: Using String.Join method to concatenate list of strings separated by comma

protected void Page_Load(object sender, EventArgs e)

    {

//Create a List of string and add items

List<string> EmpNames = new List<string>() { "Sonam", "Kabeer", "Simran", "Arjun","Randeep" };       

//Get Comma Separated String from List of strings

var Result = String.Join(", ", EmpNames.ToArray());

Response.Write(Result);

}