C#(Get the ConnectionStrings From Web Service's App.Config on Winform)

//[CONFIGURATION FILE OF WEB SERVICE]

<connectionStrings>

        <add name="ConnectionString" connectionString="Data Source=ServerName;Initial Catalog=DataBaseName;Integrated Security=True" providerName="System.Data.SqlClient" />

    </connectionStrings>

//[WEBSERVICE]

//[WebMethod]

    public DataTable connectionMethod()

    {

      //DECLARE A DATA TABLE

        DataTable dt = new DataTable();

      //GIVE A TABLE NAME OF DATA TABLE

        dt.TableName = "Connections_Table";

      //ADD COLLUMS IN THE DATA TABLE     NAME        OF       TYPE

        dt.Columns.Add(new DataColumn() { ColumnName = "Name", DataType = typeof(string) });

        dt.Columns.Add(new DataColumn() { ColumnName = "ConnectionString", DataType = typeof(string) });

        int i = 0;

      //THIS WILL GET THE ALL COLLECTION STRINGS FROM THE App.Config WHICH YOU DECLARED IN..

        foreach (var item in ConfigurationManager.ConnectionStrings)

        {

        //THIS WILL GENERATES NEW DATA ROW IN THE DATATABLE

            DataRow row = dt.NewRow();

      

        //THIS IS GETTING THE CONNECTION'S NAME FROM THE App.Config IN THE ROW CALLED NAME

            row["Name"] = ConfigurationManager.ConnectionStrings[i].Name.ToString();

        //THIS IS GETTING THE CONNECTION'S STRINGS FROM THE App.Config IN THE ROW CALLED CONNECTIONSTRING

            row["ConnectionString"] = ConfigurationManager.ConnectionStrings[i].ConnectionString.ToString();

        //THIS WILL ADD BOTH OF THE ROWS IN THE DATA TABLE

            dt.Rows.Add(row);

            i++;

        }

        return dt;

    }

//[WINDOWS FORMS]

        private void frmLogin_Load(object sender, EventArgs e)

        {

            ServiceReference1.ServiceSoapClient ConnectionService = new ServiceReference1.ServiceSoapClient();

            DataTable MyDT = new DataTable();

            MyDT = ConnectionService.connectionMethod();

            for (int i = 0; i < MyDT.Rows.Count; i++)

            {

            /*LOCAL SQL SERVER USUALLY OCCERS THIS IS TO REMOVE IT FROM ANY INDEX OF THE CONTROL IN WHICH YOU GONNA POPULATE WHICH HAS             A COLLECTION PROPERTY*/

                if (MyDT.Rows[i][i].ToString() == "LocalSqlServer")

                {

                    MyDT.Rows.RemoveAt(i);

                }

            }

            cmbServerName2.DataSource = MyDT;

            cmbServerName2.DisplayMember = "Name";

            cmbServerName2.ValueMember = "ConnectionString";

        }