Reading values from an Excel File

Question

I want to get a value from 12 excel sheet. is there any way that i get the values without opening the excel sheet? I am using vb.net. Please post an example code, if there i

Answer 1

You can use ADO.NET to read values from an Excel sheet. For more information on the connection string, see http://www.connectionstrings.com/excel-2007

You can then use a standard System.Data.OleDb.OleDbConnection to read values from the data source. For example, consider an Excel file that has a sheet named Users, with two columns, UserName and Age.

using System.Data;
using System.Data.Common;

public int UserExists(string userName, int age)
{
    var provider = ConfigurationManager.ConnectionStrings["Default"].ProviderName;
    var factory = DbProviderFactories.GetFactory(provider);

    var connectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;

    using (var connection = factory.CreateConnection())
    {
        connection.ConnectionString = connectionString;

        using (DbCommand command = connection.CreateCommand())
        {
            DbParameter userNameParameter = factory.CreateParameter();
            userNameParameter.ParameterName = "@UserName";
            userNameParameter.DbType = DbType.String;
            userNameParameter.Direction = ParameterDirection.Input;
            userNameParameter.IsNullable = false;
            userNameParameter.Value = userName;


            DbParameter ageParameter = factory.CreateParameter();
            ageParameter.ParameterName = "@Age";
            ageParameter.DbType = DbType.Int32;
            ageParameter.Direction = ParameterDirection.Input;
            ageParameter.IsNullable = false;
            ageParameter.Value = age;

            command.CommandText = "SELECT COUNT(*) FROM [Users$] WHERE UserName=@UserName AND Age=@Age";
            command.Parameters.Add(userNameParameter);
            command.Parameters.Add(ageParameter);
            connection.Open();

            int usersExits = (int) command.ExecuteScalar();

            return usersExits == 1;
        }
    }
}