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error in Generic [closed]
public void getData<T>(T ConnectionStirng)
{
    OleDbConnection con = new OleDbConnection(connectionString);  \compile error
}

OleDbConnection() // Empty parameter list

OleDbConnection(string connectionString) // takes a connection string

public void getData(string connectionString)

public IEnumerable<T> getData<T>(string connectionString)

public void getData(string connectionString)
{
   OleDbConnection con = new OleDbConnection(connectionString);
}

public TypeOfWhateverDataYouReturn GetData(string connectionString)
{
    using (var con = new OleDbConnection(connectionString))
    {
        // ...
    }
}