using the dapper sql library:
// call webapi
var students = GetApiData();
// insert in table
var sql = "insert MyTable (Stduent_Join_Date,Student_No,Student_Name) values(@Stduent_Join_Date,@Student_No,@Student_Name)";
using (var connection = new SqlConnection(connString))
{
connection.Open();
foreach(var student in students)
{
connection.Execute(sql, student);
}
}